The ABS and traction control warning lights come on when driven over 50mph, once stopped and re started they go out and as long as I don't go over 50mph they remain off any idea is it a speed sensor perhaps

 

Without a diagnostic code check, you are purely guesing.

 

Diagnostic says

C1158 Speed Wheel Sensor Coherency Fault
C1141 Wheel Speed Sensor LF tone ring tooth missing fault

spoke to mazda want to sell me new hub, can you by Tone ring separate and is it easy to fit

Thanks

 

From memory the tone ring is pressed onto the outer CV joint. I would doubt you can buy just the tone ring. FYI, I have seen one split before sending bad readings.

Did Mazda scan it for codes & inspect the vehicle?

 

Found a company in UK making quality tone rings fitting tomorrow hope all works

cheers