Accounting policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting policies

Schedule of intangible assets and goodwill

Computer software	3 to 12 years
Other acquired intangibles	5 to 10 years

Schedule of property, plant and equipment

Freehold buildings	50 years
Long leasehold property (leases with more than 50 years to run)	50 years
Short leaseholds	unexpired period of lease
Property adaptation costs	10 to 15 years
Computer equipment	up to 5 years
Other equipment	4 to 15 years