No beer outside as the club has this specified in its license, nothing to do with FA or any one else, but the licensing laws.
Harlow etc allow drinking pitch side and that is no problem, however our license dictates otherwise, some sneak through, our stewards are pretty good and tend to use common sense but they will always send you back inside during a game!
Don't mean to but in, but we are having a similar problem at Goldsdown Road with people trying to bring alcohol into the ground.
It is in fact a rule that no alcohol should be on sale for consumption on the terraces or stands. It is to do with "The Sporting Events (Control of Alcohol etc) Act 1985.
It also says that all drinks should be served in soft containers as glasses, bottles or cans can make dangerous missiles.
Hope that clears it up.