I was at Kairos Hacks last weekend, which was running parallel to HackLondon and I most certainly echo the same sentiment, it was a great outlet for a lot of my pent up energy and I'm really grateful to MLH and all of their volunteers for being awesome and providing us a very positive environment for us to make awesome things!
I ended up writing a tool that extracts meaningful information from the Spanish elections : https://github.com/shadeslayer/dataminer , which can be further visualized on a website. Its not the most proficient code ever, but it's a start :)
Have you got plans to go to more hackathons? Might see you at the next one! :)