Ask HN: Recommended Events/Meetups for UK Startup Founders?

Well, I've heard about all these startup events and hackathons and meetups and what not, and decided I want to attend a few this year. However it seems like there are literally hundreds of them over here in the UK. I mean, I checked a few directory type sites and came across about 11 pages worth of possible events planned between now and the end of December. And as a result of this, I'm a bit lost for which ones to pick. So what would you recommend? What UK based startup events and meetups do you consider the 'best' ones? The ones that someone looking to check out their competition or network with others would want to actually attend?