Hi Andy,
Eventually I worked out that my system was the OBD one. A variety of sources lead me to finding that in the 16 pin OBD socket, pin 4 (black) and pin 16(black/green)need to be 'shorted' in order to complete the blink test.
My relays were also mixed up but the one you are interested in is the one with 2 black, 1 black/green, and 1 brown/red wires.
For the codes and their meaning refer to the 300tdi ABS thread.
Hope this helps
Pete