Vehicle checks

I was told to have at least 30 minutes at the start of shift and at end for vehicle checks.
So lets say £10 an hour so its 30 minutes at start of shift and end is £10 a day x 5 = £50 X 50 weeks worked = £2500 - tax and insurance of around 25%= £1875= holiday for me and Mrs Beanie in Porto del Carmen.

There is nothing in writing to say how much time to do a check.