Business Mileage

Since its inception we have operated this system when recording our business mileage.
However despite extensive training on the subject, many of our employees still do not understand the principles; which can vary dependent on the details of the journey claimed.
This lack of knowledge frequently results in mileage forms being returned to the employee, for correction; which in administration and processing time, is clearly inefficient, and a waste of money and resources.

Does anyone use an alternative system?
My preferred option is that if you travelled from home to a temporary base, you could only claim the mileage that was over and above your normal home to work mileage. In my opinion, this is a much simpler system; that is both clear and easily understood.

Despite seeking guidance from HMRC, no assistance has been forthcoming.