Having flown a bit at North Weald I can agree with Jetblu that the a/g operator is very helpful and the circuit is user friendly for various types of aircraft. It's probably more down to the fact that there are regular movements by a wider variety of aircraft than can be found at many other airfields.
I can understand why pilots want to know immediately what the cause of a collision is, but there is really no way to know what actually happened or what state the aircraft involved were in just before it happened; for all we know it may have had nothing whatsoever to do with circuit procedures.
LOOKOUT, Aviate, Navigate, Communicate.
I'm pretty sure lookout is part of aviate but whatever.
