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Leases, Right-of-use assets (Details)
 12 Months Ended
Dec. 23, 2020
Agreement
Dec. 31, 2020
GBP (£)
LeaseholdProperty
Dec. 31, 2019
GBP (£)
Dec. 31, 2018
GBP (£)
Right-of-Use Assets [Abstract]        
Balance   £ 36,578,000 £ 0  
Effect of adopting new accounting standards   (31,000) 44,984,000  
Additions   453,000 897,000  
Remeasurements   (2,269,000) (6,849,000)  
Derecognition   (9,108,000) 0  
Depreciation charge for the year   (2,530,000) (2,454,000) £ 0
Balance   23,093,000 36,578,000 0
Lease, right-of-use assets, additional information [Abstract]        
Profit from disposal of leasehold properties   215,000 115,000 £ 0
Current lease liabilities   2,043,000 1,951,000  
Non-current lease liabilities   25,190,000 38,299,000  
Leasehold Properties and Improvements Including Right of Use Assets [Member]        
Right-of-Use Assets [Abstract]        
Derecognition   £ 9,108,000    
Lease, right-of-use assets, additional information [Abstract]        
Number of leasehold properties, terminated lease term | LeaseholdProperty   2    
Profit from disposal of leasehold properties   £ 3,700,000    
Incentive received on exit of leasehold agreement   1,400,000    
Leasehold incentive received on leasehold property   £ 1,088,000    
Number of leasehold properties, right of use assets remeasured | LeaseholdProperty   5    
Right of use assets remeasured value   £ 1,181,000    
Number of guarantee agreements associated with the termination of lease | Agreement 2      
Right-of-use assets [member]        
Lease, right-of-use assets, additional information [Abstract]        
Current lease liabilities     187,000  
Non-current lease liabilities     £ 1,870,000