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Loss Before Tax - Summary of Loss Before Tax Stated After Charging (Detail) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Material Income And Expense [Abstract]      
Amortization £ 478 £ 377 £ 230
Depreciation £ 412 £ 341 £ 141