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Auditor's remuneration (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Auditor's remuneration      
Fees payable for the audit of NatWest Group's annual accounts £ 4.9 £ 4.7 £ 4.4
Fees payable for the audit of NatWest Group plc's subsidiaries 32.3 31.9 29.6
Fees payable for audit-related assurance services 4.5 3.9 5.3
Total audit and audit-related assurance services fees 41.7 40.5 39.3
Other assurance services 0.7 1.2 0.4
Corporate finance services 0.7 0.5 0.5
Total other services 1.4 1.7 £ 0.9
Audit fees billed during the period 16.0    
Fees for review of interim financial information 1.4 1.1  
Fees for reports to the regulatory 2.8 2.3  
Fees for non-statutory audit opinions 0.3 0.4  
Fees for the auditors as reporting accountants on debt and equity issuances £ 0.7 £ 0.5