Genghis,
Flying in mixed performance circuits is a real pain in the bum, especially if you are the faster a/c., but it need not be dangerous if everyone is is in control and cooperating. I flew for a number of years at an airfield with a busy microlight school, a major R22 dealersip and school with opposite circuits 200 feet lower than the f/w circuit, and generally it works most of the time. The real problem is a/c on final. My aircraft has a stall speed which is greater than the circuit flying speed of some microlights! so get behind one on a 2 mile final and it is a nightmare, especially if as was the case, the bomber command circuits flown by many takes you over a town. This is a big no no in a pfa a/c.
The other problem is joining traffic. If one joins over the numbers at 1000 feet, it is quite possible to meet either a slow moving but steep climbing microlight at 1000 feet, or a high performance aircraft at the same point.
My pleas would be for people to fly sensible circuits sizes ie tight in, so that the faster a/c can overtake without leaving the atz, a bit more co-operation, (the aforesaid microligt school was very good at saying G whatever can take number one to us if he wants) and get rid of the stupidly long final.
Ideally ban everything that cannot maintain at least 120 knts to the threshold
As far a filing an airmiss is concerned, if the other guy makes the right noises, and I felt that he was fully situationally aware and everything was cool, but close, I wouldn't bother: life's too short for hassle. If on the other hand he was an arsehole, and clearly had a attitude which made him tempermentally unsuitable to be incommand of a guided missile, I would report, cuz twats should be groundbased. People who just make a mistake are, well, human.
