Registration button not showing on checkout page

Hi.

Just noticed that there is no user registration button on checkout page.

Users cannot register, only log in.

Having created some test ads of my own I wasn't aware of this until I logged out and tried to test it as a new user so don't know if it ever was showing.

http://finerooms.onlyinely.co.uk/classifieds/checkout/

I tried switching to default theme but it wasn't showing there either.

Any ideas?

Thanks

Pete