This definately happens - you also get the 'we will get pizza today but you have to put down an ours lunch' even if you dont see the pizza because you are dropping someone home.

I am pretty sure that time sheet alteration is illegal and is done because there is a legal requirement to have a break every x number of hours for a stipulated period of time.

Alteration of time sheets helps enterprise in any cases against an employee if they are involved in an accident. For (extreme) example MT1 works from 7am to 2am the next morning (I have done this) with no break as they are driving to collect cars. MT at 2am has an accident due to falling asleep at the wheel, when investigation into time worked over the week and previous weeks occurs the hours workee (or submitted) makes it look as though this was a one off and not gross misconduct on the part of ERAC putting the MT under pressure to do this etc etc

Even if it is confirmed by the Courts the buck will stop with the manager who is also put under pressure to doctor the sheets to keep the per unit in check for the area manager [who in turn is under pressure again] -who told them to do this in the first place, but nothing is recorded so no proof exists.

Get some proof - stop this happening an dthen you can stop complaining (like I used to on here!).