Over here, on this side of the pond, we rarely get paid to commute to the office, or the equivalent time if we are heading in a direction other than that of the office/shop. There was a thread here not to long ago that brought up this subject, and it was noted that in at least one instance/ the state government had to step in and force the employer to compensate the employees for legitimate travel time. Any time they were charging a customer for, since the customer thinks he is paying for your time,
As far as overtime, this is the norm here, all overtime MUST be approved my the manager and/or the paying customer, and we charge the customer for 1.5x the normal labor rate for overtime calls. further, if they are charging the customer, and you are not at your own "convenience" it seems like they MUST pay you, since they are charging for -your- time.