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Defined Benefit Pension Plan - Additional Information (Details) - GBP (£)
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Defined benefit pension plan    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] Interest Income (Expense), Operating Interest Income (Expense), Operating
Maximum    
Defined benefit pension plan    
Expected contributions £ 10,000,000 £ 10,000,000