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2023
£000
2022
£000
Raw materials and consumables (including subcontractor costs)307,766253,734
Staff costs (note 6)99,47986,034
Other operating charges45,36433,802
Amortisation of other intangible assets (note 12)79178
Operating lease expense:
– plant and machinery179359
– land and buildings190118
– motor vehicles234176
Depreciation (notes 13 and 14):
– owned property, plant and equipment5,4075,163
– right-of-use assets1,8401,702
Other operating income(1,852)(4,584)
Operating costs before non-underlying items458,686376,682
Non-underlying items (note 5)4,8115,424
463,497382,106
Other operating charges include:
Fees payable to the Company's auditor for the audit of the Company's annual accounts4525
Fees payable to the Company's auditor for other services:
– the audit of the Company's subsidiaries pursuant to legislation650450
– audit-related assurance services2525
– other assurance services

Other operating income mainly represents research and development tax credits.

Fees payable to KPMG LLP and their associates for non-audit services to the Company are not required to be disclosed because the consolidated financial statements are required to disclose such fees on a consolidated basis.

Details of the Group's policy on the use of the auditor for non-audit services, the reason why the auditor was used, and how the auditor's independence and objectivity were safeguarded are set out in the audit committee report on Audit committee report. No services were performed pursuant to contingent fee arrangements.