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Related party transactions - Summary of Key management personnel remunerations (Detail) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Related party transactions      
Salaries, other short-term employee benefits and non-executive fees £ 8 £ 7 £ 7
Post-employment benefits     1
Share based remuneration 14 7 8
Total £ 22 £ 14 £ 16