GroupLand 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 2017354.25,243.17,033.2496.8942.314,069.6
Additions2.470.7122.210.1535.9741.3
Transfers12.072.6141.823.4(249.8)
Disposals(1.4)(0.1)(46.4)(3.7)(51.6)
At 31 March 2018367.25,386.37,250.8526.61,228.414,759.3
Additions5.560.8126.311.6522.0726.2
Transfers(12.1)43.387.36.5(125.0)
Disposals(0.9)(42.3)(6.5)(49.7)
At 31 March 2019359.75,490.47,422.1538.21,625.415,435.8
 
Accumulated depreciation
At 31 March 2017111.6345.92,870.7335.93,664.1
Charge for the year9.439.5260.938.6348.4
Disposals(1.3)(39.3)(3.1)(43.7)
At 31 March 2018119.7385.43,092.3371.43,968.8
Charge for the year8.335.4279.334.3357.3
Transfers(0.5)0.5
Disposals(0.6)(37.7)(5.4)(43.7)
At 31 March 2019126.9421.33,333.9400.34,282.4
 
Net book value at 31 March 2018247.55,000.94,158.5155.21,228.410,790.5
Net book value at 31 March 2019232.85,069.14,088.2137.91,625.411,153.4

During the year ended 31 March 2019, there was a transfer of £17.8 million cost and associated £0.5 million accumulated depreciation from land and buildings to infrastructure assets following a data cleanse exercise in respect of the fixed asset register.

At 31 March 2019, the group had entered into contractual commitments for the acquisition of property, plant and equipment amounting to £300.7 million (2018: £430.1 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 2019 or 31 March 2018.