Air Clues ceased publication a while ago (although there are rumours that it'll be brought back in some form or another) and has been replaced by a tri-service publication called, IIRC, 'Aviate'.
From what I can recall, P/O Prune did make the odd guest appearance in Air Clues in the years up to its demise, but he wasn't a regular or major feature. I'm sure someone who read the thing more avidly than I did can confirm, though.