I have a branch in London, and a couple of employees running it. I'm thinking of opening another branch in York. The thing is, I don't know how much I'll be travelling up and down to York, and may have to suddenly go up there at short notice if a customer calls. Would buying a season ticket to York be tax-deductible in those circumstances? I'm thinking of keeping my house in London, and renting a house in York. Family will probably be up in York. Would the Revenue claim that it's commuting costs?