UK Based suppliers of modular Synthesizer kits, PCBs, panels and specialised components.
Eurorack and MU synth modules, PCBs and panels, including the System-X emulations of Roland 100m modules.
Interesting modules based on PIC processors.
Electro-Music DIY (forum)
As it says.....
Oddly named, but excellent, forum on all things synth and modular. Threads on most of my modules can be found in the "Music Tech DIY" thread.