Slightly off topic, but something I looked into Tax wise when I got my latest van.
I had been claiming Mileage allowance on my previous one. That way I didn't have to tally up and book in all the fuel receipts. The down side is off course that you cannot claim any other motor expenses, like road fund license, Insurance, and repairs etc.
In the end I have decided to claim all the separate motoring expenditure on my new van and not go the mileage allowance way. The reason for this decision and one which I dont think many are aware of, is, if you claim mileage allowance, you cannot claim Capital Allowance on the van.
If you want to claim Capital Allowance you have to claim normal motoring expenses and not mileage allowance.
Dave.