Wedding Cars & Tax Returns

Just sorted all my stuff out to send to my accountant who fills in my tax returns. Not sure if I mentioned it before but I also have a wedding car hire business. You can see the cars here. The cars have been in my family since 1977, my grandfather buying them both the same week from the Express & Star. He did a few weddings in them but they are a bit unwieldy to drive so he gave that up as he got older. I resurrected them a few years back and have been doing weddings simply to pay for the cars upkeep and earn enough to pay for a holiday or so. This year I've been doing less weddings simply because I was moving house this summer and had enough on my plate without wondering if a 80 year old car was going to start (or stop) on someone's big day...