v3.26.1
Intangible assets (Details) - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in intangible assets and goodwill    
Balance at the beginning of period £ 132  
Balance at the end of period   £ 132
IT software    
Reconciliation of changes in intangible assets and goodwill    
Balance at the beginning of period 132  
Balance at the end of period   132
Cost or valuation | IT software    
Reconciliation of changes in intangible assets and goodwill    
Balance at the beginning of period 3,844 3,865
Disposals (3,844) (21)
Balance at the end of period   3,844
Amortization | IT software    
Reconciliation of changes in intangible assets and goodwill    
Balance at the beginning of period (3,712) (2,847)
Amortization charge 131 885
Disposals £ 3,843 20
Balance at the end of period   £ (3,712)