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	Land and buildings £m	Plant and equipment £m	Aircraft and engines £m	In course of construction £m	Total £m
Cost:
At January 1, 2007	587	1,996	155	257	2,995
Exchange adjustments	19	39	—	2	60
Additions	22	88	92	102	304
On acquisitions of businesses	1	—	—	—	1
On disposals of businesses	—	(4)	—	—	(4)
Reclassifications	70	111	4	(185)	—
Transferred to assets held for sale	—	—	(12)	—	(12)
Disposals/write-offs	—	(120)	(65)	—	(185)
At January 1, 2008	699	2,110	174	176	3,159
Exchange adjustments	70	180	6	22	278
Additions	18	104	28	133	283
On acquisitions of businesses	18	—	—	—	18
On disposals of businesses	—	(13)	—	—	(13)
Reclassifications	17	69	—	(86)	—
Transferred to assets held for sale	(32)	(3)	—	—	(35)
Disposals/write-offs	(3)	(97)	(37)	—	(137)
At December 31, 2008	787	2,350	171	245	3,553
Accumulated depreciation and impairment:
At January 1, 2007	150	1,096	43	—	1,289
Exchange adjustments	7	24	—	—	31
Provided during the year1	23	139	8	—	170
On disposals of businesses	—	(2)	—	—	(2)
Transferred to assets held for sale	—	—	(5)	—	(5)
Disposals/write-offs	—	(111)	(26)	—	(137)
At January 1, 2008	180	1,146	20	—	1,346
Exchange adjustments	18	106	3	—	127
Provided during the year1	44	155	9	—	208
On disposals of businesses	—	(11)	—	—	(11)
Transferred to assets held for sale	(22)	(3)	—	—	(25)
Disposals/write-offs	(2)	(85)	—	—	(87)
At December 31, 2008	218	1,308	32	—	1,558
Net book value at December 31, 2008	569	1,042	139	245	1,995
Net book value at December 31, 2007	519	964	154	176	1,813
Net book value at January 1, 2007	437	900	112	257	1,706

¹Depreciation provided during the year is charged to the income statement or included in the cost of inventory as appropriate.

Property, plant and equipment includes:

	2008 £m	2007 £m
Net book value of finance leased assets:
Land and buildings	9	9
Plant and equipment	9	14
Assets held for use in operating leases:
Cost	141	141
Depreciation	(28)	(18)
Net book value	113	123
Non-depreciable land	113	94
Land and buildings at net book value comprise:
Freehold	533	489
Long leasehold	12	13
Short leasehold	24	17
	569	519
Capital expenditure commitments – contracted but not provided for	122	82
Cost of fully depreciated assets	475	382