I went into the wrong HAS on 20 Sqn in 1978 and found a very early Jaguar, it had a short nose gear door, splitters in front of the intakes, and simple cockpit instruments that wouldn't have looked out of place in a Hunter, in pride of place was a centrally mounted large grey/black artificial horizon.
I vaguely remember the airbrakes didn't have the perforations, but I wouldn't swear to that.