There's currently a problem with the server which means that the security code graphics cannot be generated. Since there doesn't appear to be any way of switching these off, it means that it's not possible for any new members to join GAGB.
I've managed to fight my way through the Lunarpages "support desk" and have now reached their "tech desk" (who will hopefully at least understand the problem, even if they have to pass it on to another "desk" to fix it!. If they can't sort the problem quickly, I'll have a go at removing the security code generator from the forum software. In the meantime, apologies to anyone who's desperately trying to become a GAGB member!