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Trade and other receivables - Ageing of trade receivables and provision for impairment (Details) - Trade receivables - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Gross |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | £ 705 | £ 692 |  |
Gross | Not due |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | 288 | 286 |  |
Gross | Overdue by less than 1 month |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | 170 | 158 |  |
Gross | Overdue by between 1 and 3 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | 122 | 111 |  |
Gross | Overdue by between 3 and 6 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | 54 | 56 |  |
Gross | Overdue by between 6 and 12 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | 39 | 36 |  |
Gross | Overdue by more than 12 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | 32 | 45 |  |
Accumulated impairment |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | (65) | (70) | £ (70) | £ (50)
Accumulated impairment | Not due |  |  |  |
Trade and other receivables |  |  |  |
Financial assets |  | (3) |  |
Accumulated impairment | Overdue by less than 1 month |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | (1) | (3) |  |
Accumulated impairment | Overdue by between 1 and 3 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | (3) | (5) |  |
Accumulated impairment | Overdue by between 3 and 6 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | (11) | (9) |  |
Accumulated impairment | Overdue by between 6 and 12 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | (20) | (15) |  |
Accumulated impairment | Overdue by more than 12 months |  |  |  |
Trade and other receivables |  |  |  |
Financial assets | £ (30) | £ (35) |  |

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_25&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35H&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35M&doctype=Standard -URIDate 2024-03-27 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35N -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35N&doctype=Standard -URIDate 2024-03-27 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35I&doctype=Standard -URIDate 2024-03-27 + Details
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