if their choice of language is upsetting you, why don't you just listen on their frequency without calling them?
surely there is no "Choice" of language in aviation RT, it should be correct, including the words "clearance" only used by ATCer's in their "bit of sky" which is clearly not the case.
So blundering across an ATZ irrespective of the "right & wrong" in class G argument at an airfield that does have a good mix of traffic on all sorts of approaches is not the best way. As I said before there is enough room around Cambridge to avoid it anyway but it's the OP's choice and lets not give these airfields the encouragement to apply for unneeded class D.