Expenses you incur when you travel for business can normally be expensed if you're a sole trader. This does not include costs of travel between home and work.
You can expense:
You cannot expense for:
The trip must be related to your business. If you attend to some business on a personal holiday, this can't always be expensed. For example, if you went on holiday to Portugal for a week, and visited a potential supplier's factory on one of the days, you shouldn't expense the flights or accommodation in Portugal. Your expense claim would be limited to the transport from your hotel to the factory and any costs incurred on the business trip that day.