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Financial instruments - Valuation reserves (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Dec. 31, 2021
Financial instruments - classification    
Funding - FVA £ 121 £ 90
Credit - CVA 365 390
Bid - Offer 120 113
Product and deal specific 128 119
Financial instruments valuation adjustments £ 734 £ 712