The following items have been charged/(credited) to the income statement in arriving at the group's operating profit from continuing operations:

2015
£m
Restated*
2014
£m
Other operating costs
Hired and contracted services87.385.8
Property rates80.586.2
Power68.263.3
Materials58.550.4
Charge for bad and doubtful receivables (see note 15)52.937.1
Regulatory fees29.236.2
Accommodation7.06.7
Loss on disposal of property, plant and equipment5.16.4
Legal and professional4.25.0
Operating leases payable:
Property3.73.6
Plant and equipment0.70.8
Research and development2.12.4
Cost of properties disposed0.63.9
Loss on disposal of intangible assets0.5
Movement in other provisions (see note 20)(3.4)10.9
Amortisation of deferred grants and contributions (see note 21)(7.7)(7.4)
Other34.934.3
424.3425.6
Other income
Other income(3.3)(2.7)
(3.3)(2.7)
Depreciation and amortisation expense
Depreciation of property, plant and equipment (see note 10)323.6312.9
Amortisation of intangible assets (see note 11)29.024.0
352.6336.9

* The comparatives have been restated to reflect the requirements of IFRS 11 'Joint Arrangements'. See accounting policies for details.

During the year, the group obtained the following services from its auditor:

2015
£'000
2014
£'000
Audit services
Statutory audit – group and company4339
Statutory audit – subsidiaries291216
Regulatory reporting3030
364285
Audit related services3045
Other non-audit services250203
644533