We currently own both
http://www.adlingtonmusicandarts.com and
http://www.adlingtonmusicandarts.co.uk the .co.uk address forwards to the .com and the address bar will change to show .com.
Before we purchased commercial space, we were using the space that came free with an ISP account. In the options for the domain names, there was an option to shadow the re-direct.
What this means is that the person would type
http://www.adlingtonmusicandarts.co.uk into the browser address and in the back ground, the real page that would load was a much longer URL.
The address bar would always say
http://www.adlingtonmusicandarts.co.uk no matter what page I was on but with a simple java script I was able to effectively hide the fact that the site was on a free server.
The javascript was used to hide the URLs that are displayed in the status bar at the left on the screen.