Yes, I’m sure it’s the same thing.
I’ve never had a JAP engine myself, but have played about with a couple of Villiers, hence my suggestion. I do know that wipac is (or at least was) an aftermarket parts supplier with facilities in Buckinghamshire, England. Sort of similar in some respects to what Bynorm was here. They had facilities in Bletchley, famous for Bletchley Park where the code breakers were stationed during world war 2.
