Thanks for the info.
Yes, everything was working prior to the jump start at work. Will give the odometer reset a go in the morning. It would appear to be a common issue after jump starting a WJ from all the forum chatter.
I am hoping the ratchet on the brake pedal is the answer as I did have a play with the brake pedal at work but couldn't get it to readjust itself. Have a piece of rubber taking up the slack at the moment.
I'm assuming the reservoir connector is the sensor you are talking about. It had come out of the reservoir altogether and I could see solder where it had snapped off. Will watch to see if red light is on dash.
Maybe I can live without it?
Maybe virgin fishing grounds are still within my grasp?