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Leases - Cash outflows related to leases (Details) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases      
Right of use assets £ 240 £ 220 £ 130
Short term leases 49 64  
Total cash outflow £ 289 £ 284