the online issues of the Gazette aren't always easy to search for either
Someone with Air Force Lists before heretired should be able to provide you with his service number - that makes the search of the Gazette easier.
A full set of AFLs would also give the (rough - they were up to 18 months late) date of the AFC which would make the search easier. I've got some old Lists somewhere (loft? shed?? garage???) so might be able to help given a bit of time.....
[Edited to add:]
Oops - just seen the OP has his number - I'm on the case!
[Edited again!]
A quick search of the Gazette gives no details but the date (NYHL 1978). Some awards do - I found details of Jock Stirrup's AFC a while ago - but I'm guessing that this was an "end of bl%%dy good tour" award. The striking thing is that he was one of
TEN RAF AFCs in that list!! (No details on any - Richie Profit's was in the same list.)