If I go to London for the day, for meetings, I have to buy lunch. It's never occured to me to consider it a business expense (I'm a self-employed sole trader). but today it occured to me that maybe it is. From my employed days I have a vague memory of per diem allowances for travel to certain cities - ie tax free expenses. so if an employed person can get lunch when travelling maybe it's reasonable that I can too? TIA