I Just fixed my no rear screen wash issue, it was the non-return valve next to the wiper motor. It comes apart and there is a red rubber sleeve that welds itself to the plastic. Easy to release and a quick spray of silicone and all good.
Was your spring broken in the lock like mine? 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

Yes the spring was exactly the same as yours. So that was the easy bit.
The big piece of trim was tricky to get back in place, and then of course had to come back off anyhow. I am going to use all new trim clips next for the best chance to get a snug fit.

I did clean the non return Valve, as i had heard they are problematic. I actually swapped it out for a spare Jag part I had though in the end, as the non return function seemed to stop working. I could blow air both ways through it.
I put a pin through the jets on the wiper arm too, but there’s still no liquid squirting out of there. So that needs more faffing next it seems. 2007 L322 TDV8 3.6 Vogue SE
2006 L322 S/C 4.2
2003 L322 TD6 Vogue with Facelift conversion
2000 Discovery 2 TD5 ES. Daily
1990 RRC 3.9 V8 LPG
Too many Jaguars!

Best thing ever for cleaning out washer jets is a Guitar d string, a steel wound one. 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone

I just solved my broken spring thanks to help from this thread. Saved me at least $200 that I would have spent buying a new part. Thanks heaps. 2003 TD6 HSE, Zambezi Silver, Navy Trim.

Good to hear especially from another Perth local. 2007 TDV8 VSE
2003 TD6 gone.
2002 P38a gone
1999 P38a gone
1997 p38a gone
1993 VSE gone
1992 VSE gone
1966 Series 2a with V8 conversion gone