Unwanted subdomain showing in search

Hi All

I am in the process of creating a website for a local cafe, I have put a preview page here cabin.inlaymansterms.co.uk

However it seems to be showing up in google when you search for www.inlaymansterms.co.uk
I have already tried demoting in webmaster tools

Question is how do I stop it showing up any ideas?


Thanks in advance