Few Cloudy,
I'd the same occurrence at GVA (to LHR) a few years ago.
I went into the terminal and had a look at the bunch of guys. I spoke to one who wasn't inebriated and he passed the message to his buddies who straightened up and vowed "No trouble!"
It was scheduled and a short trip so I took them; had it been longhaul then that would have been a different consideration.