v3.26.1
ACCOUNTING POLICIES - Critical judgements and accounting estimates (Details) - GBP (£)
£ in Millions
Jun. 30, 2026
May 01, 2026
Dec. 31, 2025
Disclosure of changes in accounting estimates [line items]      
Goodwill £ 1,868   £ 1,199
TSB      
Disclosure of changes in accounting estimates [line items]      
Goodwill   £ 669