Following my previous thread about the random fault codes I was getting I can now confirm that both the ABS and 4WS are now working perfectly. I was rooting around the engine bay fuse box looking for the fuses to pull to try a reset. I then noticed 3 wires that run next to the box was all chewed in half. Traced it down to the steering angle sensor. BINGO. BLOODY BINGO. I then continued to remove the fuse box and expose these wires, solder them up and reconnect the battery. Hey presto, lights go out and it works.
This was the result of a bloody field mouse that was after some lunch. Found the nest under the bonnet sound proofing. I'd call that a Resault.