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Financial risk management objectives and policies - Analysis of Fixed and Floating Rate Debt by Currency (Details) - GBP (£) £ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
US Dollar bonds | Fixed interest rate
Disclosure of detailed information about financial instruments [line items]
Borrowings and cross currency swaps	£ 1,026	£ 1,472
Fixed rate	5.24%	4.62%
Period (months)	91 months	66 months
Sterling bonds | Fixed interest rate
Disclosure of detailed information about financial instruments [line items]
Borrowings and cross currency swaps	£ 1,501	£ 1,094
Fixed rate	3.53%	2.97%
Period (months)	83 months	130 months
Eurobonds | Fixed interest rate
Disclosure of detailed information about financial instruments [line items]
Borrowings and cross currency swaps	£ 1,736	£ 1,820
Fixed rate	2.12%	2.12%
Period (months)	36 months	48 months
Eurobonds | Floating interest rate
Disclosure of detailed information about financial instruments [line items]
Borrowings and cross currency swaps	£ 4,263	£ 4,386

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2024-01-01
-Paragraph 7
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- Definition

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- Definition

Borrowings And Cross Currency Swaps

+ References

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- Definition

Average debt financing period.

+ References

No definition available.

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