At the time at least (this is also UK) you had to be under 6'1 for fast jets and although in theory you could be up to 6'4 for the big slow stuff or rotary wing initially they wouldn't know what aircraft type you'd be streamed for, so everyone had to be meet the lower height limit. I wasn't particularly interested in anything other than the fast jets either.

That said, I was also told the measurement that really mattered was the thigh length (jokes about losing kneecaps against the canopy if you ejected). So you could potentially still be accepted if you were a little over 6'1 but carried more of your height in your torso and a doctor measured your thigh length as being below a limit. I figured I was way over though and my legs don't look particularly short for my height.