Q. I'm going to represent my company on an official UK trade mission to Australia, organised by my trade body. It will involve meetings with Australian potential clients over four days in two cities. My wife will accompany me on the trip, but she will not take part in the meetings. We will stay on in Australia to enjoy a short holiday. How should I split the costs between business and personal?

A. Your wife's share of the costs, such as air-fares and hotel bills, are not a business expense, so you need to personally reimburse your company for those costs. Any expenses relating to the holiday part of the trip (e.g. hotel and car hire expenses) should also be borne by you personally, not by your company.