I have turned overheard several East Anglian military airfields, but I think always between 2000' and 3000', ie within the MATZ but not the ATZ. (Over 3000' I don't necessarily talk to them at all.) Most on approving the MATZ penetration will tell you to remain outside the ATZ or ask you whether you need a clearance for the ATZ as well, point being that they're simply reminding you that a MATZ penetration approval is not an automatic ATZ clearance as well.