(I'll add this in another post, because there's no way of adding text under a picture.)
There's little point in finding alternative ways of delivering certified documents, because they're all going to be expensive, because it's the certification that costs the money (the certificate costs about 20p to produce).
What potential campaigners should be thinking about is to lobby for a change in the law, which allows the contents of a certificate to be divulged, without the legal requirement of certification.