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Trade and other payables - Put Option Liability (Details)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Minimum    
Trade and other payables    
Cash flow period for all non-current liabilities   1 year
Maximum    
Trade and other payables    
Cash flow period for all non-current liabilities   5 years
PCI India    
Trade and other payables    
Percentage of share capital acquired through exercise of option by seller   8.00%
Proportion of ownership interest in subsidiary 65.00%