Question to the HM Treasury:
To ask Her Majesty's Government whether any travel costs for the Royal family funded by the Duchy of Cornwall can be claimed as an allowable business expense.
Appendix B of the Memorandum of Understanding on Royal Taxation [1] sets out the rules for determining the income of the Duchy of Cornwall on which tax is to be paid.
Among the expenses to be taken into account are payments made to meet official expenses incurred by The Prince of Wales and any members of his family in assisting The Queen in carrying out Her official duties.
[1] https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/208633/mou_royal_taxation.pdf