I filled out a form at the reception desk to register as a member of Lee Valley - then got a follow up email confirming my membership - took the receptionist a little chasing up with Rob to get our sign on sheet, but she confirmed my Stage 1 accreditation by the end of the day. Suspect you might need to do the same.
Cheers, I also contacted Georgina who sorted out my accreditation so I'm ready for Satge 2 now.