Thanks Tigs - all that and much more being done. The Foreign Office is, apparently, being its usual useless self. Latest from someone in touch with the family:
"Many thanks to all of you with your suggestions, both the posts and the private messages, much appreciated and all passed back to David's family.
Although there has been a huge effort by search and rescue locally to the camp where David was staying, so far no luck in finding him. So if your in the area please keep a lookout.
Any other suggestions or clues would be welcome (anyone who doesnt want to post please pm me), meanwhile if any of you feel inclined I'm sure prayers wouldnt go amiss.
thanks again, Richard"
The thread on ARRSE is here:
http://www.arrse.co.uk/cpgn2/Forums/...c/start=0.html
Sort of starting to run out of ideas now...