It's only the washer part. Should there be 'O' rings or seals on the pipe that goes to the nozzle?
We have checked everything else (Wiper nozzles, Standard VW repair for the pipe that goes into the motor unit and the connector in the rear of the roof lining). All of that is now OK.
We are still getting a jet of water into the boot from somewhere around the wiper motor rear cover.
Could it be that the internal tube to the nozzle is broken, or that some seals are missing?