The Preston Public Hall is actually still standing, though the "venue" portion of the facility was demolished in 1989.
Here's a photo of the building before the demolition of the huge back portion of the buidling:
Here's a link to a video of the Prestion Public Hall just before demolition:
http://www.lep.co.uk/retro-1980s/The-last-days-of-Preston39s.2729206.jpHere's the building today (just the front portion):