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Revenue (Details) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Rendering of engineering consultancy services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Rendering of engineering consultancy services £ 132 £ 87 £ 70