The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2024-01-01
-Paragraph 47
-Subparagraph a
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-URIDate 2024-03-27

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The percentage of an expected dividend used to calculate the fair value of share options granted.

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The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]]

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Fair value assumptions expected life.

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Weighted average assumptions.

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Share-based payments - Weighted Average Fair Value of Options Granted and Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2024 £ / shares	Dec. 31, 2024 $ / shares	Dec. 31, 2023 £ / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 £ / shares	Dec. 31, 2022 $ / shares
Weighted Average Assumptions [abstract]
Expected life (months)	48 months	48 months	48 months	48 months	48 months	48 months
Expected volatility	25.00%	25.00%	33.00%	33.00%	32.00%	32.00%
Dividend yield	4.60%	4.60%	5.60%	5.60%	3.90%	3.90%
United Kingdom
Weighted Average Assumptions [abstract]
Risk-free interest rate	3.80%	3.80%	4.00%	4.00%	2.90%	2.90%
United Kingdom \| American depository receipts
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Fair value of options \| £ / shares	£ 134.0		£ 131.0		£ 177.0
United States
Weighted Average Assumptions [abstract]
Risk-free interest rate	4.20%	4.20%	4.50%	4.50%	4.10%	4.10%
United States \| American depository receipts
Disclosure of terms and conditions of share-based payment arrangement [Line items]
Fair value of options \| $ / shares		$ 6.9		$ 8.6		$ 11.5