Afternoon all, I've had another go at this and some progress. The sensor was catching on the reluctor wheel slightly. I stripped it back out and cleaned off excess paint and a bit of corrosion on the sensor mounting. Double checked the wheel bearing was mounted properly and re assembled it all. Still touching the wheel so I created a gap and nipped it up used a tie wrap to make sure it can't move also. Any how there is now a good strong signal from the sensor. Stronger than the other side in fact so I'm pretty confident this is where my problem lies . When the weather improves I will give it a run and see what happens with the warning light. Many thanks to all who have offered assistance and a happy new year to you all.