I just got my account activated, after trying to register on the forum 4 or 5 times the last 6 months or so.
What I had to do in the end was to reach out to the Vauxhall Owners Club Facebook page and ask kindly to get my account activated, since it never worked before.
I think you need to look over your activation routines, or just secure the site enough so you don't need admin approval to get an account properly registered. One think to do to start with should be to update the forum software (SMF) from the old 1.1.17 you're currently running to the most recent 1.1.21.
There must be a lot or Senator and Carlton people trying to register, but never gets an approval.
Or maybe I'm wrong and I'm the only one who has experienced any problems
But, thanks for the add (at last). Hope to get to know you all