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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, 2004	522	1,949	337	156	2,964
Exchange adjustments	(1)	(17)	(16)	(3)	(37)
Additions	10	56	6	119	191
On disposals of businesses	(1)	(6)	—	—	(7)
Reclassifications	11	86	—	(97)	—
Disposals/write-offs	(6)	(100)	(102)	—	(208)
At January 1, 2005	535	1,968	225	175	2,903
Exchange adjustments	9	36	20	3	68
Additions	20	79	9	140	248
On disposals of businesses	—	(5)	—	—	(5)
Reclassifications	23	78	—	(101)	—
Disposals/write-offs	—	(166)	(42)	—	(208)
At December 31, 2005	587	1,990	212	217	3,006
Accumulated depreciation and impairment:
At January 1, 2004	96	941	108	—	1,145
Exchange adjustments	—	(10)	(5)	—	(15)
Provided during the year1	20	176	46	—	242
On disposals of businesses	—	(4)	—	—	(4)
Disposals/write-offs	(1)	(79)	(57)	—	(137)
At January 1, 2005	115	1,024	92	—	1,231
Exchange adjustments	4	24	9	—	37
Provided during the year1	22	154	24	—	200
On disposals of businesses	—	(4)	—	—	(4)
Disposals/write-offs	—	(122)	(19)	—	(141)
At December 31, 2005	141	1,076	106	—	1,323
Net book value at December 31, 2005	446	914	106	217	1,683
Net book value at December 31, 2004	420	944	133	175	1,672
Net book value at January 1, 2004	426	1,008	229	156	1,819

1. Includes impairment charge of £11m (2004 £50m) relating to the write-down of aircraft to values provided by independent aircraft appraisers.

Property, plant and equipment includes:

	2005 £m	2004 £m
Net book value of finance leased assets	41	48
Assets held for use in operating leases:
Cost	196	206
Depreciation	(93)	(79)
Net book value	103	127
Non-depreciable land	96	97
Land and buildings at net book value comprise:
Freehold	416	388
Long leasehold	14	16
Short leasehold	16	16
	446	420
Capitalised interest included in net book value of assets in course of construction	—	2
Capital expenditure commitments - contracted but not provided for	147	86
Net book value of assets held as security for liabilities	49	46
Cost of fully depreciated assets	399	342