I can rattle off a few other one design classed that allow two or three different sail makers into the rule book, why not here?
I am in the process of buying a new job for my 20 and as much as I like the EP I can find myself spend twice of what I spent on a 5.8NA jib a few years back - hence going to another local sail maker.
BTW - has Portsmouth looked at re-rating the Inter 20?