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Wow, thanks for that, very helpful; a picture is worth a thousand words etc. Shuttle valve and non return valve quite clear there. Now to summon the will to skin my knuckles the next dry weekend. May try sticking a vacuum pump on the pipe to see if I can shift the blockage that way first...

The rear wash pump motor runs (1999 1.3 cvt micra k11, 34,000 on the clock) , but nothing comes out of the rubber pipe when detached from the rear screen nozzle. The factory manual has a nice picture of the check valve, but doesnt give the game away by telling you where - in 12 foot of pipe...