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Earnings per share (EPS) (Details) - GBP (£)
£ / shares in Units, £ in Millions, shares in Millions
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Basic EPS      
Basic earnings from continuing operations £ 2,216 £ 2,714 £ 2,182
Basic earnings from discontinued operations 74 5,083 171
Basic total earnings £ 2,290 £ 7,797 £ 2,353
Basic EPS (continuing) (in GBP per share) £ 0.600 £ 0.742 £ 0.606
Basic EPS (discontinuing) (in GBP per share) 0.020 1.389 0.048
Total basic earnings per share (in GBP per share) £ 0.620 £ 2.131 £ 0.654
Weighted average number of shares – basic (in shares) 3,692 3,659 3,599
Diluted EPS      
Diluted earnings from continuing operations £ 2,216 £ 2,714 £ 2,182
Diluted earnings from discontinued operations 74 5,083 171
Diluted total earnings £ 2,290 £ 7,797 £ 2,353
Diluted EPS (continuing) (in GBP per share) £ 0.597 £ 0.738 £ 0.603
Diluted EPS (discontinuing) (in GBP per share) 0.020 1.383 0.047
Diluted EPS (in GBP per share) £ 0.617 £ 2.121 £ 0.650
Weighted average number of shares – diluted (in shares) 3,709 3,676 3,616
Reconciliation of basic to diluted average number of shares      
Weighted average number of shares – basic (in shares) 3,692 3,659 3,599
Effect of dilutive potential ordinary shares – employee share plans (in shares) 17 17 17
Weighted average number of shares – diluted (in shares) 3,709 3,676 3,616