Usually "Request desktop site" means booting you back to the homepage of the desktop site.
The same works in reverse. In Chrome Dev Tools I can set the UA to iPhone/iPad/Android (http://imgur.com/mJY6lP6) and I should expect to see a mobile version of the site. Of course, with Responsive this does not work since responsive looks at screen size, not UA string.
For example, try changing your UA string in Chrome to iOS 6 and visit http://www.bbc.co.uk/