@KTS915 - sorry, I wasn't very clear there.
Without this code, if a free member signs up to my site I get 2 emails.
One is an S2 Member 'registration email', and one is a WP 'new user' email.
If they are signing up for S2 level 1, I'll also get an email from my payment gateway - i.e. Paypal.
WITH this code in place, I still get the S2 registration email, and a payment provider email, if premium, but NO standard WP 'new user' email.
I hope that's a bit clearer?
The next time a user signs up, I'll screenshot the emails if that helps?
Thanks again, it's much appreciated.