When ten of us flew Virgin to Delhi on our way for a couple of weeks paragliding in the Himalaya in October '05, in the LHR departure lounge one of our party turned to the rest and said, "Bless me" (well, okay, only one of those words is one he actually used
), "that's Chris Bonington over there."
I wasn't one of our group who then spoke to Sir Chris but several of the party did and he was a very amiable chap, by all accounts.