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RESTRUCTURING COSTS (Details) £ in Millions |  | 6 Months Ended
--- | --- | ---
Jan. 08, 2026 | Jun. 30, 2026 GBP (£) | Jun. 30, 2025 GBP (£)
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Restructuring costs |  | £ 169 | £ 26
Restructuring costs, operating model transformation |  | 168 |
Restructuring costs, gain on site closures |  | £ 21 |
Number of geographical operating units | 6 | 6 |
Expense of restructuring activities, operating model transformation, severance and other termination benefits |  | £ 151 |
Cost of sales |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Restructuring costs |  | 9 | 11
Selling, general and administration |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Restructuring costs |  | 156 | 14
Research and development |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Restructuring costs |  | £ 4 | £ 1

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