Ok – i’ve managed to solve it.
I’ve installed the Quick Page/Post Redirect Plugin
then setup a quick redirect for /wp-login.php?checkemail=registered & have set it to redirect to a confirmation page.
Looks like it could be a very useful plugin – one to remember.
I’m sure that will be useful, but it doesn’t solve the problem (I just tried).
If a user completes the registration form, they are then taken straight to wp-login.php.
I want to prevent this & send them to a confirmation page instead.