v3.25.1
Share-based payments - Summary of options outstanding (Details)
OPTION in Millions
12 Months Ended
Mar. 31, 2025
OPTION
£ / shares
Mar. 31, 2024
OPTION
£ / shares
Mar. 31, 2023
OPTION
£ / shares
Mar. 31, 2022
OPTION
£ / shares
Summary of options outstanding and exercisable        
Outstanding shares | OPTION 65 70 62 61
Weighted average exercise price £ 0.62 £ 0.66 £ 0.87 £ 1.02
Weighted average remaining contractual life 23 months 31 months    
Minimum        
Summary of options outstanding and exercisable        
Weighted average exercise price £ 0.58      
Maximum        
Summary of options outstanding and exercisable        
Weighted average exercise price £ 1.57