Group

Land and buildings
£m
Infra- structure assets
£m
Operational assets
£m
Fixtures, fittings, tools and equipment
£m
Assets in course of construction
£m
Total
£m
Cost
At 1 April 2015303.64,888.06,264.0487.2884.412,827.2
Additions4.598.0106.37.4449.6665.8
Transfers19.1134.8156.511.1(321.5)
Disposals(0.3)(0.1)(47.2)(7.6)(55.2)
At 31 March 2016326.95,120.76,479.6498.11,012.513,437.8
Additions6.780.1107.010.5513.6717.9
Transfers24.342.3494.622.6(583.8)
Disposals(3.7)(48.0)(34.4)(86.1)
At 31 March 2017354.25,243.17,033.2496.8942.314,069.6
Accumulated depreciation
At 1 April 201595.5275.22,441.4298.83,110.9
Charge for the year9.034.6249.639.3332.5
Impairment11.411.4
Disposals(0.3)(0.1)(42.2)(5.8)(48.4)
At 31 March 2016104.2309.72,660.2332.33,406.4
Charge for the year10.136.0253.137.0336.2
Impairment0.20.2
Transfers0.2(0.2)
Disposals(2.7)(42.8)(33.2)(78.7)
At 31 March 2017111.6345.92,870.7335.93,664.1
Net book value at 31 March 2016222.74,811.03,819.4165.81,012.510,031.4
Net book value at 31 March 2017242.64,897.24,162.5160.9942.310,405.5

At 31 March 2017, the group had entered into contractual commitments for the acquisition of property, plant and equipment amounting to £335.2 million (2016: £439.0 million).

In addition to these commitments, the group has long-term expenditure plans which include investments to achieve improvements in performance required by regulators and to provide for future growth.

Company

The company had no property, plant and equipment or contractual commitments for the acquisition of property, plant and equipment at 31 March 2017 or 31 March 2016.