For one food tastes much better. Next time you’re in London try this:
http://www.danslenoir.com/london/
Other interesting approaches are described here
http://en.wikipedia.org/wiki/Dialogue_in_the_Dark
From Wikipedia: The foundation stone for the social enterprise Dialogue in the Dark was laid in 1986. At that time the founder, Andreas Heinecke, worked as a journalist and documentary writer for a broadcasting corporation in Germany. One day he was instructed to develop a training program for a colleague who had lost his eyesight. At the first meeting Andreas Heinecke felt above all pity and insecurity. However, he was fascinated by the world of blind people, and he was shocked by the discrimination against them, to which they are still exposed today.
In December 1988 Dialogue in the Dark had its premiere in Frankfurt, Germany. For over 10 years was touring throughout the world as a a travelling exhibition in museums or as a special event on fairs and festivals. The first permanent exhibition was established in Hamburg, Germany (Dialog im Dunkeln) in 2000.
Until now there have been exhibitions in over 25 countries and more than 150 cities in America, Asia, Europe and the Middle East. Meanwhile there are also numerous permanent exhibitions in Japan, Italy, Israel, and the USA, to name a few. The most recent permanent exhibition opened in Singapore on October 2009.