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Tax - Tax losses (Details) - GBP (£) £ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Unused tax losses |  |
Deferred tax asset | £ 1,894 | £ 2,178
Total losses carried forward |  |
Unused tax losses |  |
Deferred tax asset | 1,019 | 952
Total losses carried forward | UK |  |
Unused tax losses |  |
Deferred tax asset | 959 | 900
Total losses carried forward | UK | NatWest Markets Plc |  |
Unused tax losses |  |
Deferred tax asset |  | 3
Total losses carried forward | UK | National Westminster Bank Plc |  |
Unused tax losses |  |
Deferred tax asset | 362 | 445
Total losses carried forward | UK | RBS plc |  |
Unused tax losses |  |
Deferred tax asset | 597 | 452
Total losses carried forward | Ireland | UBIDAC |  |
Unused tax losses |  |
Deferred tax asset | 5 | 6
Total losses carried forward | Ireland | NWM N.V. |  |
Unused tax losses |  |
Deferred tax asset | £ 55 | £ 46

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2023-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2023-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_o&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_56&doctype=Standard -URIDate 2023-03-23 + Details
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