| Financial year end | 
              2007-03-31 | 
              2008-03-31 | 
              2009-03-31 | 
              2010-03-31 | 
              2011-03-31 | 
              2012-03-31 | 
              2013-03-31 | 
              2014-03-31 | 
              2015-03-31 | 
              2016-03-31 | 
              2017-03-31 | 
              2018-03-31 | 
              2019-03-31 | 
            
            
            | Income from legacies | 
              £1,882,542.00 | 
              £989,999.00 | 
              £1,135,586.00 | 
              £992,242.00 | 
              £943,867.00 | 
              £1,237,056.00 | 
              £1,321,295.00 | 
              £2,213,076.00 | 
              £1,937,780.00 | 
              £2,677,017.00 | 
              £3,780,440.00 | 
              £2,753,471.00 | 
              £2,725,186.00 | 
            
            
            | Income from endowments | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Voluntary income | 
              £3,475,608.00 | 
              £1,851,552.00 | 
              £2,093,939.00 | 
              £1,960,551.00 | 
              £1,892,745.00 | 
              £2,116,211.00 | 
              £2,159,590.00 | 
              £3,158,658.00 | 
              £2,989,398.00 | 
              £5,099,204.00 | 
              £5,627,942.00 | 
              £4,602,959.00 | 
              £4,966,346.00 | 
            
            
            | Activities generating funds | 
              £779,052.00 | 
              £661,209.00 | 
              £1,022,004.00 | 
              £1,329,712.00 | 
              £2,004,370.00 | 
              £1,963,212.00 | 
              £2,379,456.00 | 
              £2,730,752.00 | 
              £3,056,639.00 | 
              £2,654,305.00 | 
              £2,918,963.00 | 
              £2,105,082.00 | 
              £152,079.00 | 
            
            
            | Income from charitable activities | 
              £0.00 | 
              £1,031,617.00 | 
              £798,468.00 | 
              £790,424.00 | 
              £1,166,170.00 | 
              £833,290.00 | 
              £830,088.00 | 
              £869,691.00 | 
              £875,835.00 | 
              £1,531,943.00 | 
              £994,673.00 | 
              £1,084,915.00 | 
              £1,193,521.00 | 
            
            
            | Investment income | 
              £118,876.00 | 
              £174,749.00 | 
              £151,832.00 | 
              £71,786.00 | 
              £102,475.00 | 
              £73,292.00 | 
              £80,820.00 | 
              £101,900.00 | 
              £158,461.00 | 
              £180,899.00 | 
              £178,009.00 | 
              £242,986.00 | 
              £189,349.00 | 
            
            
            | Other income | 
              £0.00 | 
              £48,899.00 | 
              £45,600.00 | 
              £50,509.00 | 
              £52,158.00 | 
              £66,600.00 | 
              £64,701.00 | 
              £73,437.00 | 
              £78,405.00 | 
              £0.00 | 
              £0.00 | 
              £1,111,042.00 | 
              £2,883,274.00 | 
            
            
            | Total income | 
              £4,373,536.00 | 
              £3,768,026.00 | 
              £4,111,843.00 | 
              £4,202,982.00 | 
              £5,217,918.00 | 
              £5,052,605.00 | 
              £5,514,655.00 | 
              £6,934,438.00 | 
              £7,158,738.00 | 
              £9,466,351.00 | 
              £9,719,587.00 | 
              £9,146,984.00 | 
              £9,384,569.00 | 
            
            
            | Investment gains | 
              £20,728.00 | 
              £-148,850.00 | 
              £-331,303.00 | 
              £342,218.00 | 
              £55,097.00 | 
              £50,994.00 | 
              £237,154.00 | 
              £174,112.00 | 
              £304,853.00 | 
              £-236,841.00 | 
              £524,623.00 | 
              £-73,656.00 | 
              £191,258.00 | 
            
            
            | Gains from asset revaluations | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Gains on pension fund | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Voluntary income costs | 
              £143,961.00 | 
              £177,653.00 | 
              £250,111.00 | 
              £392,289.00 | 
              £441,058.00 | 
              £235,082.00 | 
              £513,207.00 | 
              £496,265.00 | 
              £537,309.00 | 
               | 
               | 
               | 
               | 
            
            
            | Fundraising trading costs | 
              £254,259.00 | 
              £216,502.00 | 
              £365,750.00 | 
              £470,217.00 | 
              £640,968.00 | 
              £984,912.00 | 
              £914,607.00 | 
              £1,354,666.00 | 
              £1,648,506.00 | 
               | 
               | 
               | 
               | 
            
            
            | Investment management costs | 
              £21,438.00 | 
              £22,013.00 | 
              £17,856.00 | 
              £20,374.00 | 
              £22,033.00 | 
              £22,103.00 | 
              £24,469.00 | 
              £28,758.00 | 
              £25,767.00 | 
              £30,346.00 | 
              £64,800.00 | 
              £37,507.00 | 
              £27,287.00 | 
            
            
            | Grants to institutions | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Charitable activities costs | 
              £2,849,523.00 | 
              £3,106,475.00 | 
              £3,257,175.00 | 
              £3,422,321.00 | 
              £3,448,590.00 | 
              £3,716,373.00 | 
              £4,198,948.00 | 
              £4,357,175.00 | 
              £4,568,450.00 | 
              £4,818,452.00 | 
              £5,197,256.00 | 
              £5,738,032.00 | 
              £6,457,928.00 | 
            
            
            | Governance costs | 
              £13,418.00 | 
              £17,356.00 | 
              £18,647.00 | 
              £18,618.00 | 
              £20,887.00 | 
              £14,906.00 | 
              £19,684.00 | 
              £20,763.00 | 
              £40,685.00 | 
              £21,214.00 | 
              £35,736.00 | 
              £71,439.00 | 
              £10,951.00 | 
            
            
            | Other expenses | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Total expenses | 
              £3,282,599.00 | 
              £3,539,999.00 | 
              £3,909,539.00 | 
              £4,323,819.00 | 
              £4,573,536.00 | 
              £4,973,376.00 | 
              £5,670,915.00 | 
              £6,257,627.00 | 
              £6,820,717.00 | 
              £7,181,666.00 | 
              £7,910,252.00 | 
              £8,821,498.00 | 
              £9,349,964.00 | 
            
            
            | Support costs | 
              £382,828.00 | 
              £594,366.00 | 
              £622,366.00 | 
              £606,490.00 | 
              £590,190.00 | 
              £494,548.00 | 
              £643,723.00 | 
              £500,340.00 | 
              £639,428.00 | 
              £1,439,195.00 | 
              £960,056.00 | 
              £1,061,622.00 | 
              £1,107,103.00 | 
            
            
            | Depreciation | 
              £144,658.00 | 
              £137,497.00 | 
              £130,995.00 | 
              £142,455.00 | 
              £154,929.00 | 
              £121,068.00 | 
              £135,875.00 | 
              £195,104.00 | 
              £184,275.00 | 
              £188,546.00 | 
              £191,758.00 | 
              £264,332.00 | 
              £244,745.00 | 
            
            
            | Reserves | 
              £6,756,100.00 | 
              £6,733,929.00 | 
              £1,624,648.00 | 
              £1,932,271.00 | 
              £4,119,525.00 | 
              £7,777,789.00 | 
              £4,583,688.00 | 
              £5,645,718.00 | 
              £6,247,841.00 | 
              £4,303,754.00 | 
              £4,597,941.00 | 
              £3,792,350.00 | 
              £3,784,183.00 | 
            
            
            | Fixed assets at start of year | 
              £5,204,539.00 | 
              £5,477,919.00 | 
              £6,330,731.00 | 
              £6,136,635.00 | 
              £6,037,225.00 | 
              £6,557,759.00 | 
              £6,931,321.00 | 
              £7,124,516.00 | 
              £7,349,998.00 | 
              £7,765,541.00 | 
              £9,072,226.00 | 
               | 
               | 
            
            
            | Fixed assets at end of year | 
              £5,477,919.00 | 
              £6,330,731.00 | 
              £6,136,635.00 | 
              £6,037,225.00 | 
              £6,557,759.00 | 
              £6,931,321.00 | 
              £7,124,516.00 | 
              £7,349,998.00 | 
              £7,765,541.00 | 
              £9,072,226.00 | 
              £11,240,713.00 | 
              £11,394,774.00 | 
              £11,397,560.00 | 
            
            
            | Fixed investment assets at start of year | 
              £2,837,054.00 | 
              £3,020,820.00 | 
              £3,565,151.00 | 
              £3,223,247.00 | 
              £3,203,393.00 | 
              £3,691,004.00 | 
              £3,783,912.00 | 
              £4,070,322.00 | 
              £4,299,103.00 | 
              £4,278,200.00 | 
              £5,431,867.00 | 
               | 
               | 
            
            
            | Fixed investment assets at end of year | 
              £3,020,820.00 | 
              £3,565,151.00 | 
              £3,223,247.00 | 
              £3,203,393.00 | 
              £3,691,004.00 | 
              £3,783,912.00 | 
              £4,070,322.00 | 
              £4,299,103.00 | 
              £4,728,200.00 | 
              £5,431,867.00 | 
              £6,703,124.00 | 
              £6,842,602.00 | 
              £6,793,270.00 | 
            
            
            | Current investment assets | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Cash | 
              £483,405.00 | 
              £633,913.00 | 
              £558,814.00 | 
              £619,038.00 | 
              £783,357.00 | 
              £841,099.00 | 
              £534,052.00 | 
              £1,139,533.00 | 
              £1,194,864.00 | 
              £2,188,543.00 | 
              £1,574,729.00 | 
              £1,507,227.00 | 
              £1,460,520.00 | 
            
            
            | Total current assets | 
              £1,617,348.00 | 
              £932,975.00 | 
              £973,479.00 | 
              £1,231,616.00 | 
              £1,474,163.00 | 
              £1,447,309.00 | 
              £1,281,950.00 | 
              £1,888,616.00 | 
              £1,945,727.00 | 
              £2,961,001.00 | 
              £2,968,124.00 | 
              £3,335,758.00 | 
              £3,654,231.00 | 
            
            
            | Creditors within 1 year | 
              £287,671.00 | 
              £377,686.00 | 
              £353,093.00 | 
              £290,439.00 | 
              £354,041.00 | 
              £570,526.00 | 
              £517,468.00 | 
              £505,922.00 | 
              £335,702.00 | 
              £586,167.00 | 
              £427,819.00 | 
              £697,684.00 | 
              £816,730.00 | 
            
            
            | Long term creditors or provisions | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £23,650.00 | 
              £23,650.00 | 
              £23,650.00 | 
              £0.00 | 
            
            
            | Pension assets | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Total assets | 
              £6,807,596.00 | 
              £6,886,020.00 | 
              £6,757,021.00 | 
              £6,978,402.00 | 
              £7,677,881.00 | 
              £7,808,104.00 | 
              £7,888,998.00 | 
              £8,732,692.00 | 
              £9,375,566.00 | 
              £11,423,410.00 | 
              £13,757,368.00 | 
               | 
               | 
            
            
            | Endowment funds | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
              £0.00 | 
            
            
            | Restricted funds | 
              £51,496.00 | 
              £152,091.00 | 
              £38,983.00 | 
              £32,299.00 | 
              £691,601.00 | 
              £345,749.00 | 
              £251,116.00 | 
              £36,079.00 | 
              £90,384.00 | 
              £1,240,151.00 | 
              £121,838.00 | 
              £164,676.00 | 
              £346,585.00 | 
            
            
            | Unrestricted funds | 
              £6,756,100.00 | 
              £6,733,929.00 | 
              £6,718,038.00 | 
              £6,946,103.00 | 
              £6,986,280.00 | 
              £7,462,355.00 | 
              £7,637,882.00 | 
              £8,696,613.00 | 
              £9,285,182.00 | 
              £10,183,259.00 | 
              £13,635,530.00 | 
              £13,844,522.00 | 
              £13,888,476.00 | 
            
            
            | Total funds | 
              £6,807,596.00 | 
              £6,886,020.00 | 
              £6,757,021.00 | 
              £6,978,402.00 | 
              £7,677,881.00 | 
              £7,808,104.00 | 
              £7,888,998.00 | 
              £8,732,692.00 | 
              £9,375,566.00 | 
              £11,423,410.00 | 
              £13,757,368.00 | 
              £14,009,198.00 | 
              £14,235,061.00 | 
            
            
            | Employees | 
              90 | 
              88 | 
              95 | 
              100 | 
              105 | 
              117 | 
              139 | 
              144 | 
              155 | 
              246 | 
              263 | 
              308 | 
              323 | 
            
            
            | Volunteers | 
              656 | 
               | 
               | 
               | 
               | 
               | 
              1205 | 
              1501 | 
              1500 | 
              950 | 
              1200 | 
              1300 | 
              1400 | 
            
            
            | Consolidated accounts | 
              true | 
              true | 
              true | 
              true | 
              true | 
              true | 
              true | 
              true | 
              true | 
              false | 
              false | 
              false | 
              false | 
            
            
            | Charity only accounts | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
               | 
            
            
            | Financial year start | 
              2006-04-01 | 
              2007-04-01 | 
              2008-04-01 | 
              2009-04-01 | 
              2010-04-01 | 
              2011-04-01 | 
              2012-04-01 | 
              2013-04-01 | 
              2014-04-01 | 
              2015-04-01 | 
              2016-04-01 | 
              2017-04-01 | 
              2018-04-01 |