I have since cleaned the contacts under the driverside seat. I have already done the passenger seat and I'm still getting fault on the dash.
So this fault is not under the seats, unless I need to cut them out and solder them which I'm reluctant to do.
I do think that the answer is somewhere within the fault being intermitted depending on the temperature of the outside or engine temperature. Like I've said, it seems I only get the fault when it's cold outside (usually when it drops below 13 degrees, its got worse it seems as earlier this year it would only occur when the temperature drop below 5 or 6 degrees.).
Does anyone have any experience of these symptoms and issues?