Really envious, would love one of those!
There are two websites that might be handy with your search. First,
www.parkatmyhouse.com, a site that connects people who need to park with people who have available space.
Also,
www.sharemystorage.com - similar to the above but for storage, including garages.
Incidently, for anyone else reading this, both sites are a great way to make money if you have spare space - a church in Kings Cross made £120,000 from renting it's carparking space out during the week when not in use. (Fyi, I don't work for either, so this is not stealth PR! I've attented business workshops where I met the founders and love the ideas behind them).
Good luck!