On a related topic - there are certain aerdromes that fall just within the London CTR. Obviously there are rules governing joining, circuits, departure etc, so as not to conflict with London inbound/outbound traffic. What therefore is your take on transponder use in the circuit or in vicinity of the aerodrome?
Some aerodromes advocate transponder on standby in the circuit, but mode C when departing. Would it not be a lot easier at these fields if everybody squawked charlie all of the time? Surely there is enough seperation at these places as not to invoke a TA, and wouldn't it make the picture clearer to controllers (instead of just getting primary returns?)
I understand there was also some consideration to use a generic circuit squawk code, which would sure help at these fields (again with "c") Whatever happend to that?