The ECTA had developed its own rulebook. If I remember correctly, it follows the SCTA book pretty closely in many respects -- to allow racers from one venue to compete at the other without finding too many surprises. There are some differences, though -- so you'd be wise to get the ECTA rulebook and follow the dictates therein if you're going to compete at Maxton.
As an example (and this is only one difference) -- at Bonneville bikes don't need a front brake; at Maxton, bikes running over 175 DO need front brakes (MUCH SHORTER stopping distance at Maxton!).
I'm not trying to represent ECTA -- just trying to emphasize that having (and using) both rulebooks is wise (read: necessary).