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Tax - Tax losses (Details) - GBP (£) £ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Unused tax losses |  |
Deferred tax asset | £ 2,178 | £ 1,195
Total losses carried forward |  |
Unused tax losses |  |
Deferred tax asset | 952 | 899
Total losses carried forward | UK |  |
Unused tax losses |  |
Deferred tax asset | 900 | 840
Total losses carried forward | UK | NatWest Markets Plc |  |
Unused tax losses |  |
Deferred tax asset | 3 | 56
Total losses carried forward | UK | National Westminster Bank Plc |  |
Unused tax losses |  |
Deferred tax asset | 445 | 608
Total losses carried forward | UK | RBS plc |  |
Unused tax losses |  |
Deferred tax asset | 452 | 176
Total losses carried forward | Ireland | UBIDAC |  |
Unused tax losses |  |
Deferred tax asset | 6 | 11
Total losses carried forward | Ireland | NWM N.V. |  |
Unused tax losses |  |
Deferred tax asset | £ 46 | £ 48

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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 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_o&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_56&doctype=Standard -URIDate 2022-03-24 + Details
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