If it helps anyone for future fixed place speed cameras (gatsos etc) can only monitor 1 lane even if markings are on both sides, if you can nip over the white lines your unlikly to be cought. I didn't know this untill i followed a mate through one, he swerved to the other side of the road and i went stright through and ended up with 3pts and £60 fine! >:(
Glad to hear nobody was seriously hurt