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Basis of preparation and accounting policies (Tables)
 12 Months Ended
Dec. 31, 2022
Statement [Line Items]  
Estimated Useful Life of Assets Depreciation is calculated on a straight-line basis over the estimated useful life of the assets as follows:
 
Freehold buildings
   :    50 years
Leasehold buildings and improvements
   :    50 years or period of lease, whichever is shorter
Plant, machinery and equipment
   :    2 to 20 years
Office furniture, fittings and equipment
   :    2 to 20 years
Motor and transport vehicles
   :    4 to 11 years
Disclosure of detailed information about intangible assets useful life
A summary of the policies applied to the Group’s intangible assets is as follows:
 
    
Trademarks
   
Technology
know-how
   
Development costs
Useful lives    Indefinite    8 years    *
Amortization method used    No amortization    Amortized on a straight-line basis over the period of the technology know-how    *
Internally generated or acquired    Acquired    Internally generated    Internally generated
 
  *
Development costs relate to
on-going
development projects that have not been completed and are not available for use.
Disclosure of detailed information about right-of-use assets useful life
Right-of-use
assets are depreciated on a straight-line basis over the shorter of the lease term and estimated useful lives of the assets, as follows:
 
    •    Leasehold land    3 to 50 years
       
    •    Building and office space    1 to 6 years
       
    •    Office furniture, fittings and equipment    5 years
       
    •    Motor vehicles    12 years