Thanks again to everyone who responded to my 'word of inspiration' post... I had my first class since I had the problems and it was fine!
I had made it very clear to th teacher that I would not carry on unless I had her support and she agreed and had words with the children before we started. I tried the following suggestions from you guys;
1. Kids sat boy, girl
2. I gave them all English names which is a great help especially seeing half of them have Breton names which I cant pronounce!
3. I had a little cards with red crosses on them. If they were really naughty or were rude they got a card. 3 cards meant they were to be sent to the headmaster. Luckily out of 30 kids only gave five cards and it seemed that as soon as I gave 1 to a child they quickly started to behave!
4. I had very clear set activities which were designed with 5 minutes 'active time' (we were doing colours so I said a colour and they had to find something in the room in that colour) followed by 5 minutes 'concentrate' time (worksheets).
So a MASSIVE thank you.... I wont be dreading going back next week now!