Thanks guys. Glad all is OK as I was a bit worried about him.
I found his mobile number and his yahoo email address after posting this last night.
I was trying to contact him on behalf of some people that we met there a couple of years ago, so I have passed on all of the details that i have to them.
I was in touch with him when he was in Istanbul a few weeks ago and he was in his usual form
As usual, thanks for all of your help.
Margaret.