10. Other operating expenses
Other operating expenses include insurances, costs of accommodation and inventory, auditor’s fees, publicity costs, maintenance costs of operating assets and additions to provisions.
Auditor’s fees
(in millions of euros) | 2022 | 2021 |
Statutory audits | 4.4 | 4.0 |
Other assurance engagements | 0.5 | 0.6 |
Tax advisory services | - | - |
Other services | - | - |
Total | 4.9 | 4.6 |
The auditor’s fees include the fees of both the services in the Netherlands and those of the foreign network (including the United Kingdom, which is presented as results from discontinued operations). The share of the foreign network in the statutory audits for 2022 is € 2.0 million (2021: € 1.8 million).