You could always pm or email Daniel Slater - he lives in York so you could ask him. Find him on the Mambers list. Although why there should be PJ activity in York at this time of year I don't know.
Thanks, Chris. It's just that we are there this weekend and I don't know whether there might be permanent exhibitions (like V&A) or anything else happening. As suggested, I've dropped a line to Daniel Slater.