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VARIABLE INTEREST ENTITIES - Narrative (Details) - GBP (£)
£ in Millions
Dec. 31, 2025
Jan. 03, 2024
Variable Interest Entity, Not Primary Beneficiary    
Noncontrolling Interest [Line Items]    
Investments in the unconsolidated VIE £ 15.5  
Maximum exposure to loss from the unconsolidated VIE £ 15.5  
JV Partner    
Noncontrolling Interest [Line Items]    
Preferred ownership (as a percent)   100.00%
Equity ownership percentage (as a percent) 50.00%  
JV Partner    
Noncontrolling Interest [Line Items]    
Ownership percentage held by parent (as a percent) 90.00%