Here's a question that I actually can answer from first-hand experience. About 25 years ago, I was on University Challenge and the studio was right next door to the Coronation Street set.
It was late at night so we were free to walk on to the set: we sat in Hilda Ogden's kitchen, played darts in the Rover's (they were bent) and, of course, pulled a pint. It was pretty digusting, it was warm, very weak, beer. It was like the shandies I drank as a kid - but not so nice.
Of course, things might have changed since then but in 1980, that's what the good folk of Weatherfield had to put up with.