Land and buildingsa £m		Plant and equipment £m		Assets in course of construction £m		Total £m
Cost
1 April 2001	3,480		35,456		1,966		40,902
Acquisitions of subsidiary undertakings	-		7		-		7
Additions	42		871		3,005		3,918
Transfers	44		2,726		(2,770	)	-
Demerged with mmO2	(625	)	(4,447	)	(1,018	)	(6,090	)
Disposal of subsidiary undertakings	-		(328	)	-		(328	)
Other disposals and adjustments	(1,957	)	(1,540	)	-		(3,497	)
Total cost at 31 March 2002	984		32,745		1,183		34,912
Depreciation
1 April 2001	1,566		17,775		-		19,341
Acquisitions of subsidiary undertakings	-		1		-		1
Charge for the year - depreciation	123		3,265		-		3,388
Charge for the year - impairmentc	-		292		-		292
Demerged with mmO2	(182	)	(1,692	)	-		(1,874	)
Disposal of subsidiary undertakings	-		(130	)	-		(130	)
Other disposals and adjustments	(1,094	)	(1,036	)	-		(2,130	)
Total depreciation at 31 March 2002	413		18,475		-		18,888
Net book value at 31 March 2002	571		14,270		1,183		16,024
Engineering stores	-		-		54		54
Total tangible fixed assets at 31 March 2002	571		14,270		1,237		16,078
Net book value at 31 March 2001	1,914		17,681		1,966		21,561
Engineering stores	-		-		64		64
Total tangible fixed assets at 31 March 2001	1,914		17,681		2,030		21,625

	2002 £m		2001 £m
aThe net book value of land and buildings comprised:
Freehold	343		1,514
Long leases (over 50 years unexpired)	34		170
Short leases	194		230
Total net book value of land and buildings	571		1,914

	2002 £m		2001 £m
bExpenditure on tangible fixed assets comprised:
Plant and equipment
Transmission equipment	1,373		1,655
Exchange equipment	428		478
Other network equipment	694		918
Computers and office equipment	273		407
Motor vehicles and other	189		231
Land and buildings	153		171
Increase (decrease) in engineering stores	(10	)	(3	)
Total continuing activities	3,100		3,857
Plant and equipment
Transmission equipment	380		640
Exchange equipment	-		1
Other network equipment	262		262
Computers and office equipment	113		167
Motor vehicles and other	28		20
Land and buildings	25		39
Total discontinued activities	808		1,129
Total expenditure on tangible fixed assets	3,908		4,986

^cThe impairment includes £29 million in relation to the write down of street payphones and £263 million in relation to BT Ignite's European activities (see note 20).