What is the best way to show my clients a demo so there is no mention of brick&mobile?
You can set up this client as a sub-domain ( i.e. m.yourclient.co.uk) and then demo this client site with your URL.
This is the preferred method that way demos are run under our brand.
Your site is still active at http://m.brickandmobile.com/RRI-Mobile - but you may want to hide that URL...
You can learn how to make a custom URL by watching this quick tutorial video.
Hope this helps!