In reply to subtle:
EN standards for mountaineering equipment didn't exist in the early 90's, so selling those ice screws wasn't illegal back then. It would be now.
Brexit will have no immediate bearing on standards, and there are no plans for the UK to leave CEN. I can't see any UK based manufacturer having any interest at all in paying for separate UK certification when they'd need to certify to CE standards anyway in order to sell into the huge market right on their doorstep. BD certify to CE standards despite being a US based company, by way of example.