As I said earlier, loving the User Registration add on!
I hvae found a bug/error though, it doesn't effect the functionality, but just appears for some reason.
The message is:
Warning: Illegal offset type in /home/gillbus/domains/gillinghamdorsetbusiness.com/public_html/wp-content/plugins/gravityformsuserregistration/userregistration.php on line 1510
Here is a screenshot: http://screencast.com/t/YIQMSBceKJ
And here is a link to the page it happens on (only after registration): http://www.gillinghamdorsetbusiness.com/members/registration/