Information from John Hudson
The college entrance was in via the LEFT door (RED one). The whole building is now used a residential house.
Hope it helps you to put Liverpool on the map as regarding radio colleges.
As well as Riversdale there was a college called Merseyside College of Radio in Rumford Street Liverpool. This was run by Gerry Ludden and Doc Walsh. When it closed in about Apri 1965,Gerry Ludden the principal and all their students transferred to Riversdale Tech (me included)
Brian Cotton was at Riversdale as a lecturer same time as Gerry Ludden.