I can't be much help, I'm afraid - but as a website editor I guess I am bound to post some sort of reply!
The form in question may perhaps have been accessible from the old website, but I can find nothing in current resources (
i.e. uploaded files going back a while which may or may not currently be accessible via a Downloads link) that answers the description.
It's possible I suppose that the form might have been removed because of incompatibility with the move to WebCollect.
I suggest an enquiry to the
Membership Secretary - and I will happily add the form to Downloads once it has been identified, if that is considered useful.
Richard