Who's a prat?

Birmingham today, and the new job on my list is loading up all of the phone bill transactions for the company mobiles to a database so we can analyze them properly. There are something like 30,000 transactions per month so it is a non-trivial exercise. The review was prompted by the discovery that one of the employees had somehow managed to run up £500 worth of personal calls on his mobile, thinking that it would all just go unnoticed on the company account. He is pretty fortunate to get away with just paying it back and not losing his job.