Very useful thanks. A technician did actually show me today also.
Regarding screen washer jets on my car: Dealer has looked and decided to replace,under warranty,all 3 jets.
The rear one was completely blocked with crap and the front ones not directing the water properly!
And the car is only just over 18 months old so a little disappointing to say the least.
Disappointing yes, but depends on the previous owner(s) using a decent quality screenwash fluid