Ok bit of a fail to be honest...
Sods law the heavens opened as soon as I took the wheel off!
Gave the sensor a good look over and it appeared 'ok'? Went to remove it anyway, but the bolt holding it in place was very corroded and was difficult to see it's an allen key or a torque?
It looked like a 6mm allen key but it just rounded off with only slight pressure it was that old
Anyway checked both sides and they were covered in metal shavings, I'm guessing thats normal considering what they do, so gave them a good clean but will have to find a better day so I can get the discs off to tap them out.
Lights are still on...