2017 £m	2016 £m
Revenue	690.2	600.6
Cost of sales	(429.9)	(378.4)
Gross profit	260.3	222.2
Other operating income	4.5	4.4
Distribution costs	(21.3)	(20.9)
Administration expenses	(118.6)	(101.7)
Other operating expenses	(1.0)	(4.4)
Headline operating profit	123.9	99.6
Amortisation of acquired intangible fixed assets	(4.5)	(4.5)
Operating profit prior to exceptional items	119.4	95.1
Exceptional items	–	(0.6)
Operating profit	119.4	94.5

Exceptional items comprise:

	2017 £m	2016 £m
Acquisition costs	–	0.6
	–	0.6

Profit for the year has been arrived at after charging/(crediting):

	2017 £m	2016 £m
Net foreign exchange (gains)/losses	–	(0.5)
Inventory expensed	53.0	48.2
Depreciation of property, plant and equipment	58.1	54.1
Amortisation of intangible fixed assets	6.2	5.6
Gain on disposal of property, plant and equipment	(0.7)	(4.5)
Staff costs (see note 4)	283.8	239.5
Acquisition costs	–	0.6
Impairment loss on trade receivables	0.8	1.2
Impairment of fixed assets – recognised in operating profit	0.4	5.1

The analysis of auditor's remuneration on a worldwide basis is as follows:

	2017 £m	2016 £m
Fees payable to the Company's auditor for the audit of the Company's annual accounts	0.1	0.1
Fees payable to the Company's auditor and its associates for other services:
The audit of the Company's subsidiaries	0.7	0.7
Total audit fees	0.8	0.8
Audit related assurance services*	0.1	0.1
Total non-audit fees	0.1	0.1
	0.9	0.9

In addition to the amounts shown above, the auditor received fees of £7,000 (2016: £6,800) for the audit of the Group's pension schemes.

Fees paid to Deloitte LLP and its associates for non-audit services to the Company are not required to be disclosed.

A description of the work of the Audit Committee is set out in the Audit Committee report and includes an explanation of how auditor objectivity and independence is safeguarded when non-audit services are provided by the auditor.

* This includes £0.1m (2016: £0.1m) for the review of the half year report.