Hi everyone
I know this post is reasonably old but i believe this is a relevant question for employing staff whom use their own vehicles.
we pay our staff 20p a mile to aid the cost of their travel at the end of the year they can then claim the remainder back from a self assessment with HMRC
https://www.gov.uk/tax-relief-for-employees/vehicles-you-use-for-workwe also charge the client this 20p a mile and base it from our office for example if the client is 6 miles from our registered office we would charge them a extra £2.40 return trip on top of their £14hr rate.
the clients understand the need to do this and are aware before agreements that we will clean their property and the staff get the money they are owed keeping them happy and in return they do a good job keeping everyone happy.