v3.24.1.1.u2
Property, plant and equipment - Disclosure of movements of right-of-use assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance £ 671 £ 505
Exchange adjustments (12) 24
Additions 200 286
Reclassifications 0  
Reclassification to held for sale (13)  
Disposals (3) (14)
Depreciation charge for the year (115) (130)
Right-of-use assets, ending balance 728 671
Land and buildings    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 281 225
Exchange adjustments (5) 10
Additions 52 101
Reclassifications 0  
Reclassification to held for sale (12)  
Disposals (1) (13)
Depreciation charge for the year (22) (42)
Right-of-use assets, ending balance 293 281
Plant and machinery    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 150 70
Exchange adjustments (2) 1
Additions 2 97
Reclassifications (5)  
Reclassification to held for sale 0  
Disposals 0 0
Depreciation charge for the year (17) (18)
Right-of-use assets, ending balance 128 150
Assets in the course of construction    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 0 0
Exchange adjustments 0 0
Additions 0 0
Reclassifications 0  
Reclassification to held for sale 0  
Disposals 0 0
Depreciation charge for the year 0 0
Right-of-use assets, ending balance 0 0
Motor vehicles and office equipment    
Disclosure of quantitative information about right-of-use assets [line items]    
Right-of-use assets, beginning balance 240 210
Exchange adjustments (5) 13
Additions 146 88
Reclassifications 5  
Reclassification to held for sale (1)  
Disposals (2) (1)
Depreciation charge for the year (76) (70)
Right-of-use assets, ending balance £ 307 £ 240