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Staff numbers and costs - Government grants and assistance (Details)
€ in Millions, £ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2021
GBP (£)
Mar. 31, 2021
Apr. 30, 2020
GBP (£)
Mar. 31, 2022
EUR (€)
Mar. 31, 2022
GBP (£)
Mar. 31, 2021
EUR (€)
Disclosure of detailed information about borrowings [line items]            
Payroll supports received amount | €       € 82   € 84
HMT and Bank of England Covid Corporate Financing Facility (CCFF) [Member]            
Disclosure of detailed information about borrowings [line items]            
Amount of financing raised     £ 600      
Debt Extension Term   12 months        
Interest rate percentage   0.46% 0.44%     0.46%
Repayment of borrowings £ 600       £ 600