I think it will depend on whether it is your personal car that you are using for business or is the car owned by your company (so your beauty business).
You will need to check the HMRC website. But from recollection, if it is your car you offset 40p per mile for 10,000 then 25p after that.
If it is owned by your company you can offset it all, however you will pay more personal tax because it is a benefit in kind.
It's a long time since I worked for an accountancy service, but I think that's how it worked.