Hi Mike, the same wires that are a problem under the passenger seat are also problematic under the drivers seat
worth a wiggle
.
next progression is to disconnect the connectors under the seats and spray with contact cleaner disconnecting and reconnecting a few times. then if its still not cured water under the carpets is common and can cause failure of the sensors under the carpets.
Once you get into this depth you will probably need the codes reading on the car to find out where the fault lies.
If you do get this far contact Bigruss in Liversedge there is nothing Russ doesn't know about our cars and he has reasonable rates for a comprehensive service provided.
Where abouts in Leeds are you?