My Brother was one of 2 Captains on BA.
Standard response, AAIB, Police, they were all breathalyzed then sent to hotel. Left the next day. Fortunately made it back in time to go to Paris to watch England loose.
It was no great shakes.
Although,he did say the best decision he had made that day was to give away the sector to the other Captain who hadn't done much handling recently (apparently a little paper work is involved)