You should record the date, destination and distance of each business journey you drive in your own car. It is good practice to record the total on your car's milometer at the start and end of each journey. Your employer can pay you up to 45p per mile for each business related journey you drive. Business journeys do not include normal commuting between your home and your permanent workplace. If your employer is VAT registered it will be able to reclaim VAT on part of the mileage allowance you receive, if you provide VAT receipts to the value of the fuel used. The VAT receipts do not have to exactly match the dates of your journeys. When travelling by public transport keep the receipt for the ticket.
http://www.thebestof.co.uk/local/buxton/business-guide/feature/chronicle-accountants/88434
