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.
For scraping content, because Yelp renders it's content in AJAX callbacks, it required Phantom JS and Python with it's awesome beautifulsoup library.
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