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Leases, Maturity analysis undiscounted finance and operating lease income (Details) - GBP (£)
£ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income £ 816 £ 630  
Unearned finance income (40) (39)  
Net investment in the lease 776 591  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income 0 158 £ 220
Less than One Year [Member]      
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income 720 318  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income 0 96 176
One to Two Years [Member]      
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income 96 300  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income 0 50 11
Two to Three Years [Member]      
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income 0 12  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income 0 12 11
Three to Four Years [Member]      
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income 0 0  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income 0 0 11
Four to Five Years [Member]      
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income 0 0  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income 0 0 11
More than Five Years [Member]      
Maturity analysis undiscounted finance lease income [Abstract]      
Total undiscounted finance lease income 0 0  
Maturity analysis - undiscounted operating lease income [Abstract]      
Total undiscounted operating lease income £ 0 £ 0 £ 0