Here we are then:
First general advice don't let anyone tell you that removing the front bumper is easy.
Car in at 0800. Return for collection at 1030. Car ready but one side misaligned by 2-3mm in relation to the metal wing. Taken back into service. Watched while technician prised (all with SEAT specialist tools sir)and heaved and pushed on the flappy loose top of the plastic bumper.
Alerted service advisor, workout continues all using specialist SEAT tools , sir. They looked like tyre levers to me.
Alerted Service Manager who attends and offers advice.
Bumper off again.
At this point, 1215, I decide to drive away in a loan car to avoid apoplexy.
At 1515 I receive a call that all is complete.
On return .......... it is complete and fine and valeted
Oh and the wobbly sensor? That's now secure. Apparently it was not located in its clip and so was pushing from the inside out as the whole bumper was screwed up tight against the metal bodywork in the factory causing the bulge.
So all is well that ends well.
Message to all: is this a one off or a factory line habit? Check your front sensors if you have specified them on a non FR