Hi Phelim,
No diybio place that I know in Cambridge. However, there is a hacker space in Cambridge bootstrap(
http://makespace.org/), which is a good place to start a diybio meetup/space.
I have been to two scibarcamb barcamps in 2011 and 2012(
http://www.scibarcamb.org/), and both times talked about DIYBio, got a good reception. Unsure if there will be a 2013 one.
That said, get yourself to a weekend day at londonbiohackers.
Cheers
Brian