Yes: 5 O-Levels, including Maths, English and a science subject, IIRC.
Reading this thread has reminded me that earlier this year I failed to notice the demi-centenary
of my appearance at OASC. Judging from the
Fighter Pilot video, little can have changed in the following 14 years. That includes the naivety of the majority of the candidates, myself included! No doubt today's handful of hopefuls are far better briefed, if not more worldly wise, than we were.