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Accounting policies (Tables)
 12 Months Ended
Dec. 31, 2019
Text block [abstract]  
Schedule of Reconciliation about operating lease obligations
The following table reconciles the opening balance for the lease liabilities as at 1 January 2019 based upon the operating lease obligations as at 31 December 2018:
 
£ million
  
 
 
Operating lease commitments at 31 December 2018
  
 
3,628.2
 
Short-term and low value leases not included in lease liabilities
  
 
(73.8
) 
Extension options reasonably certain to be exercised
  
 
115.1
 
Signed leases not yet commenced
  
 
(598.1
) 
Gross lease liabilities at 1 January 2019
  
 
3,071.4
 
Effect of discounting
  
 
(745.2
) 
Lease liabilities at 1 January 2019
  
 
2,326.2
 
 
Summary of Estimated Useful Life of Intangible Assets
Amortisation is provided at rates calculated to write off the cost less estimated residual value of each asset on a straight-line basis over its estimated useful life as follows:
 
•
 
Brand names (with finite lives) – 10-20 years.
 
•
 
Customer-related intangibles – 3-10 years.
 
•
 
Other proprietary tools – 3-10 years.
 
•
 
Other (including capitalised computer software) –
3-5 years.
Summary of Estimated Useful Life of Property, Plant and Equipment Depreciation is provided at rates calculated to write off the cost less estimated residual value of each asset on a straight-line basis over its estimated useful life, as follows:
 
•
 
Freehold buildings – 50 years.
 
•
 
Leasehold land and buildings – over the term of the lease or life of the asset, if shorter.
 
•
 
Fixtures, fittings and equipment –
3-10
years.
 
•
 
Computer equipment –
3-5
years.