I’ve done a site and google search and not found a tread on the issue. 
The rear hatch washer isn’t working; although I can hear the pump, nothing coming out of the nozzles. There isn’t liquid coming out from under the inner tailgate cover so the pipe may not have become disconnected. Anyone know if these prone to blockages and if so, what’s the best way to unblock them? 

Škoda usually put a join in the N/S/R of the car, the nozzle blocks (non fan jet approved fluid will do this) and the pipe pops off. 

Thanks. Do you have any idea where the join is located; in the cabin, tailgate or behind the panelling? 

If it’s not leaking, it sounds like the same problem on my old car.

There was only one pump and when you switched from front/rear all it did was activate a little mechanism that blocked one pipe and opened the other. 
I fixed it by emptying the tank (just keep spraying) and then put hot water in from the kettle and keep switching between front and back. It was just a bit stuck and it was fine after that 👍

Cheers matey. I’ll give that a whirl! 👍🏻

Mine's blocked a few times - stuck a pin in the jet and wiggle around and off it goes again.  Noticed today the jet has got a bit weak so must be getting clogged again, time to find the pin...

So it turned out it was the nozzles that were blocked; I needed a slightly thinner pin! God they’re sods to set up, aren’t they?