You also know I have already replaced (as per PP diagnostics) the Rear RH speed sensor and I do not have any juddering under the brake pedal to suggest the rings are fooked. When doing the sensor rings looked A-OK.
Sometimes I can clear the fault and it goes away for ages, othertimes (like today) I clear the fault, drive for a couple of miles and it comes back on, and within a minute of engine start up.
The ONLY other thing I think it may be is the connection box that sits above the fuel tank:

My plan would be to eliminate the connection altogether, chop out the connection box, solder together and use heat shrink to seal it in.
Any other bright ideas?
PP is also describing it again as a ''permanent fault''