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Commitments and contingencies (Details)
12 Months Ended
Dec. 31, 2020
GBP (£)
LeaseholdProperty
Dec. 31, 2019
GBP (£)
Contractual obligations [Abstract]    
Lease liabilities - existing £ 45,737,000 £ 66,591,000
Lease liabilities - contingent 6,566,000 7,045,000
Manufacturing 3,324,000 4,311,000
Capital commitments 77,000 1,460,000
Total contractual obligations £ 55,704,000 79,407,000
Number of leasehold properties under contractual obligations | LeaseholdProperty 2  
Contingent commitment £ 6,566,000 7,045,000
Less than 1 year [Member]    
Contractual obligations [Abstract]    
Lease liabilities - existing 3,529,000 4,469,000
Lease liabilities - contingent 0 68,000
Manufacturing 2,824,000 3,669,000
Capital commitments 77,000 1,460,000
Total contractual obligations 6,430,000 9,666,000
1-3 years [Member]    
Contractual obligations [Abstract]    
Lease liabilities - existing 5,322,000 8,958,000
Lease liabilities - contingent 2,254,000 1,604,000
Manufacturing 500,000 642,000
Capital commitments 0 0
Total contractual obligations 8,076,000 11,204,000
3-5 years [Member]    
Contractual obligations [Abstract]    
Lease liabilities - existing 4,286,000 7,876,000
Lease liabilities - contingent 2,471,000 2,685,000
Manufacturing 0 0
Capital commitments 0 0
Total contractual obligations 6,757,000 10,561,000
More than 5 years [Member]    
Contractual obligations [Abstract]    
Lease liabilities - existing 32,600,000 45,288,000
Lease liabilities - contingent 1,841,000 2,688,000
Manufacturing 0 0
Capital commitments 0 0
Total contractual obligations £ 34,441,000 £ 47,976,000