Definitely worth checking out http://www.techhub.com/
Google Campus http://www.campuslondon.com/
Campus, powered by Google, offers seven floors of flexible work spaces, free high speed internet and all the support you need to fuel your ideas. We'll be hosting mentoring programmes, speaker series, networking events and much much more. So if you're a London-based startup or are just passing through town, we invite you to join the Campus community.
Tech City Overview http://en.wikipedia.org/wiki/East_London_Tech_City
Overview and hot companies
There are more than 3,000 tech firms in east London, employing up to 50,000 people in the digital economy. Here are 20 companies to watch out for
Accelerator Programme attached to London Met Uni
White Bear Yard
Clerkenwell Workshops provides bright, imaginative space for over 75 innovative small businesses. The studio and workshop space – together with an external central courtyard, fantastic café/bar, and various meeting rooms – provide accommodation for a thriving entrepreneurial community that benefits from the collaborative environment created by the people who work within it.
LinkedIn group for Startups with 1000 members Plus their Facebook and Paper.li
https://www.facebook.com/LondonStartups 700 likes
Questions people ask about London StartUps on Quora
Great Overview http://www.quora.com/Startups-in-London/What-is-the-startup-scene-like-in-London
WAYRA - O2 sponsored start-ups
Venture Capital Funds that invest in startups
if your tech company does something innovative, they may be able to claim R&D money back
Less Important - But good background if you have time to read
Lean start up movement and training for start ups
Springboard combines investment capital with an intensive 13 week mentor-led accelerator programme. Whilst the Springboard program is based at Google Campus in London and ideaSpace in Cambridge, it is aimed at ambitious and scalable early stage businesses from both UK and overseas.
There was a start up digest newsletter (covering london) but it got bought out by these guys in October (i think) http://startupweekend.org/2012/10/03/startup-weekend-acquires-startupdigest-and-turns-it-into-a-non-profi/
But they are still doing global & local start up events email
Tech Meetup groups
Digital Sizzle http://www.thedigitalsizzle.com/about.html
Quarterly meetups for startup (Year old)
If you want to Market your start up, Do check out Digital Doughnut who run a FREE digital marketing event in Hoxton Square on the last Tuesday of Month. They also do paid training that will give your digital marketing rocket fuel. N.B. Digital Doughnut are our main client and we work very closely together, great bunch of guys.