I'd just run Toaf and see if it agrees with your left front suspicions. Then either change sensor or bearing, or both. Some sensors are better than others, some require bits shaved off them to move the sensors closer to the bearing's magnetic strip. I know DMGRS have original rear sensors (ordered a couple as can't get better than original), someone might be able to advise on good front sensors.
Good luck
PS. Link to Best of British, says they are MG/Rover sensors:
https://www.ebay.co.uk/itm/265017968...QAAOSwcCdgBXOW