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AUTHORISED AND ISSUED SHARE CAPITAL (Tables)
 12 Months Ended
Dec. 31, 2025
Disclosure of classes of share capital [abstract]  
Summary of Authorised and Issued Share Capital
Equity ordinary shares1
Nominal value
£m
Authorised
At 1 January 20231,750,000,000 175 
At 31 December 20231,750,000,000 175 
At 31 December 20241,750,000,000 175 
At 31 December 20251,750,000,000 175 
Issued and fully paid
At 1 January 20231,141,427,296 114 
Exercise of share options85,900 — 
At 31 December 20231,141,513,196 114 
Exercise of share options248,625 — 
Share cancellations(50,367,570)(5)
At 31 December 20241,091,394,251 109 
Exercise of share options— — 
Share cancellations— — 
At 31 December 20251,091,394,251 109 
Note
1Ordinary shares have a par value of £0.10