So it took a while to get a location sorted out, but the lovely folks at the Troubadour Pub came to the rescue. See link.
http://www.beerintheevening.com/pubs/s/62/6263/Troubadour/West_Brompton

Our first hirer is Gino, a web developer from London with a talent for drying people's hands. Things started off slow, the human hand dryer was ignored or laughed at.
We wondered whether the creation of a human hand dryer was in fact a stupid idea...then for some reason all the folk decided that the electric hand dryer just wasn't giving them enough attention. We're guessing it had something to do with beverage consumption. Maybe not...maybe everyone in the pub sat down, discussed it, and came to the conclusion that a human hand dryer was more effective than an electric one.
Yes, it was probably just the beer.

Anyway cheers Gino for your handywork. Enjoy your year's free telephony.

On another note, if you run a pub or know a landlord who would be up for sheltering our humble hand dryer then send us an email: giffgaffteam@mailuk.custhelp.com