The Izal factory was in Chapeltown, Sheffield opposite a very good pub called The Commercial run by a friend of mine. It's now a housing estate.
Also years ago when the Kipper Family first started Chris Sugden showed me an absolutely garish kipper tie someone had given him. It was probably worn by a travelling salesman or rep for Izal. It was a garish yelowy green and litthe toilet rolls and the Izal brand name in triangle one of the worst things i've ever seen.