Rob has put a couple of barriers against bots registering, one based on a question and one based on the speed that the bot fills in the form. We'll monitor their effectiveness going forward.
talked to Rob, seems no new members have spammed just old ones. So as ken said a clear out is needed of members who have joined but not been active. One's who lurk we will see they have been logging in etc so leave them
and if admin are on holiday then no one gets to join....and they have a ton of emails when they get back.
You could say the same for the Motorsport question that people don't know, once they have clicked the contact admin I don't think there is a simple solution