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Non-Current Deferred liabilities (Details) - GBP (£)
£ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Non-Current Deferred liabilities [Abstract]    
Deferred revenue £ 24,868 £ 47,961
Non-current deferred revenue (Note 19) £ 24,868 £ 47,961