http://gyazo.com/91a80e934c1b2c76e61a13cc7551d71f.png
If I type that in i get the following The Shire, London, UK to Two Towers - Google Maps apparently it takes 56 mins
You have to specify that you want walking direction by clicking on the 'walking man' to the right of the 'car' and 'bus/train' icons
http://gyazo.com/dd4764170a92797f54b...png?1328362528
You will then get the warning about the route you have 'chosen'
It didn't work the first time i tried that. dose now.