Thanks guys - it is Martin and Dave. I'm impressed that you tried to identify the background but the photo was taken below Scafell, the same day of the group photo I submitted five previous to this one.
As regards Martin McGuiness I had to look him up on the web to see what he looked like as I left the UK 35 years ago - I guess Ollie looks more like him than I do !
Removed User - 25/Jul/12
Too easy this one Ian - I clocked Olly from the thumbnail. Don't think you'll ever manage to disguise him. Let's have some more. Not too hard, mind...