I've been around and around their website and I don't find it clear. But I guess it's the usual thing - either you have to visit in person or pay for a librarian to send you a copy of the document remotely. They don't say how much it costs but if it's similar to other archives, maybe £25-30? I'll check, but if so then that's unaffordable. If genealogy only required the purchase of a single document like this, fair enough, but it requires scores of such docs and is therefore potentially an enormous money pit. I understand why they charge, but does it need to be so expensive?
OK, rant over. Thanks to all who replied.
: )