Consolidated cash flow statement (Parenthetical) - GBP (£) £ in Millions	Sep. 30, 2026	Sep. 30, 2025
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	£ 308
Bank overdrafts	£ 30	£ 0

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant