A part of the ATZ for our local 'big' aerodrome (in Class G) juts out over the sea. One of our residents thinks it is clever to fly UNDER the ATZ (quite legal but very silly).
Generally, if I am able, I will go along with a 'clearance' issued to route above the ATZ, even though we both know such a 'clearance' isn't really valid with a Basic service. I do this on the basis that
a) tomorrow I might be in the overhead myself doing instrument training and appreciate the co-ordination with other traffic
b) I might need to descend into the ATZ to avoid weather etc.
We have regular liaison meetings between all the local airfields and the ATC unit where we can talk about these things over a cuppa. Don't Cambridge do the same thing?
TOO