SutekhTinpot RoyalCrusader Royal
Only once segregation became a thing.
I have been to games when the Tilehurst End was the away end (official) and where everyone was just mixed in. Some games the South Bank was pretty much the away end !
Which is was as far back as I can remember (first game in 1989)
You used to be able to pay 50p(?) or something to walk through to the South Bank from the Town End and that was late 70s/early 80s so segregation didn't strike me as much of a thing at EP until the mid 80s when suddenly fences and Bristol City fans appeared.
The Town End became designated away fans only in early 1980's, when the first fences were put up following issues and pitch invasions with Bristol City as above, and Portsmouth also caused a number of problems in 1977 & 1979. A few years later the stand nearest the town end (A stand I think it was) was also designated away.