Ok - Renewed one sensor now all are showing @1050 ohms resistance which fluctuate when the wheel is spun.

Have confirmed power from battery (pole 2 - ABS Mainplug) but no power from the main relay (ignition on 1) from either poles 8 & 20.

Pump Relay clicks after @10 secs from ignition switched on can also hear the pump.

As I can't get a reading from the main relay via the ABS Mainplug, is it worth replacing the relay or am I incorrectly testing it?