Wed 22 May 2013
It's online here. Hopefully people find it useful, it's got data from Foursquare, Yelp and a few other sources.
The site itself is built in Python, Bottle, Bootstrap and MySQL, though I hope to upgrade to Postgres with PostGIS when I get the time. I also want to make it look a lot less bootstrappy.
If you're trying it out from outside the UK, give it a go with Buckingham Palace's postcode and see what coffee shops the Queen can escape to! SW1A 1AA