First quick look at the (excellent) photos would suggest most recently on No 84 Sqn in Cyprus. Not only was it the last RAF unit to fly the Wessex, but the blue stripe aroung the body and the Union Flag under the nose was used as they were - in part - on UN duties......
Will check the logbook(s) for more history on those partivular Wessi; I was never lucky enough to get a Cyprus posting, but the numbers look familiar.....