The German Embassy’s Think German Campaign:
http://www.london.diplo.de/Vertretung/london/en/06/1Language/3ThinkGerman/Campaign.html
UK-German Connection
http://www.ukgermanconnection.org/home
The German Academic Exchange Service
http://www.daad.org.uk/en/index.html
The Goethe Institut
http://www.goethe.de/ins/gb/lon/enindex.htm?wt_sc=london_
The Prince's Teaching Institute
Other Local German Networks:
in Kent:
http://www.kent.ac.uk/secl/german/news/?view=2821
in Wales:
http://walesgermannetwork.wordpress.com/
in Oxford:
In the North East: