I found a dreaded drip of hydraulic fluid on the opening for the ultrasonic sensors.
I have dismantled it today:

This looks dry. Passed a piece of tissue around it and is completly dry.


Looks dry but the mount is missing (left of the hydraulic connection)

Its a bit wet down there. No drop but when I wiped the underside of the cylinder there was fluid present.

Found this rolling around (the mount for the cylinder).

My conclusion for now is that it must be the cylinder. I checked the reservoir and the hydraulics in the boot and all is fine there.

Any opinions welcome.

Cheers

Rishi