It may be worth trying David Sampson, formerly of Oakdene Nursery, Broad Oak, East Sussex. He shut the nursery last year I think, but I suspect he would be happy to supply the odd plant still. He inherited Gerry Mundey's collection (almost entire, I think) when he died and used to have a number of his Primula hybrids. he hasn't moved house, so contact details are probably still as per nursery (see Google). If not, I may be able to chase up a more recent number/email.
Alex
