Divert and ban the drunken brawlers - don't make everyone suffer because a few cheap women behave like boozed-up sluts. They can take the boat or train back to whichever hovel whence they came.
Alcohol on an empty stomach won't help - I see that ba are ditching free economy class food on flights of less than 5 hours from next year. Their solution is to sell you an expensive M&S sandwich - but they won't accept cash, unlike other low cost airlines. For that's what they've become now.