I think we came to the conclusion that it didn't matter much in real life, because if you're VFR and squeezing between the top of an ATZ at 2,200' and the bottom of controlled airspace at 2,500' you haven't got a lot of choice, and if you're IFR then anything you do is almost certainly illegal under the new rules, possibly because EASA doesn't really get this UK habit of hobby pilots flying IFR outside controlled airspace.
Which doesn't help you with exam answers, I'm afraid.