What annoys me is pilots or ask to join left/right base or long final when the circuit is active with 2 or more aircraft.
I,ve never asked any of the above unless i know the circuit is quiet.
These guys are usually doing commercial training and flying the "expeditious approach", leaving everyone else second guessing where they are going to turn up.
I'm just waiting for a confussed student to hit one turning final.
Having worked at Coventry i'm not suprised that type of accident doesn't happen more often and elsewhere.