alternatively, you just ask anyone that you encounter, in your best Franglais, ou est le bus avec le conduire tres miserable et le / la courier qui ne pas interessment de votre problem? Or words to that effect.
I'm going with Baxters mainly because I didn't sort out accommodation and travel early enough to get something decent but I'm not expecting much in the way of en-route service. The problem I found when I went with them last time was that most of their staff were mainly volunteers, mates and relatives of Graham B, etc. They were not getting paid so we were very much at the mercy of whether they could be bothered to help. In 03 I found that they generally couldn't give a monkeys, to the extent that on the way out I used the bus at Fougeres to change my kit (on one of seats because the driver wouldn't open the toilet) and attempted a couple of hours' sleep at Carhaix but couldn't get warm because the driver wouldn't close the doors, but I didn't even bother checking in on the way back. The final straw was when I was back at the hotel and I encountered one of Graham's pals emptying the coach latrine immediately in front of the door we all had to go through to collect our bags and dismantle the bikes.
Since then Sporting Tours has been taken over and I had an encouraging call with the new MD, who seems keen to shake off the "enthusiastic amateurs" style, so it will be interesting to see how it goes this time around.