CREDIT IMPAIRMENT CHARGES - Additional Information (Details) - GBP (£) £ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Disclosure of impairment loss and reversal of impairment loss [line items] | ||
| Impairment losses on loans and advances to banks | £ 0 | £ 0 |
| Impairment losses on non-trading reverse repurchase agreements | 0 | 0 |
| Impairment losses on other financial assets at amortised cost | 0 | 0 |
| Impairment losses on financial assets at FVOCI | 0 | £ 0 |
| TSB | ||
| Disclosure of impairment loss and reversal of impairment loss [line items] | ||
| Credit impairment losses | £ 62 | |