From Jan to Apr 2014, we'll work through Ch2 and 3 of SICP. We meet weekly at NBCU's offices in central london. Are sessions are of the "code dojo" format, and we'll pair you up with another programmer to work through an exercise. We expect that you've read the relevant section and come ready with questions/problems.
We're running two review sessions on ch1 in Nov/Dec of 2013.