Its not working

I filled it up and the front ones work fine (although one of the nozzle thingys has come off - where can I get these?)

Rear washer just doesnt wanna know, anyone know why? or where to start looking to fix it?

The front nozzles are probably a dealer job, but shouldn't be too expensive I imagine. As for the rear washer, can you see a puddle under the car when you try and use it? It MAY help identify which of the following joints has gone: connection at washer pump behind NSF wheel arch liner; at connection in bulkhead behind filter box; at connection behind trim where back of NSR seat meets NSR door opening; connection at rear wash/wipe pump. I say 'may' as the undertray makes it hare to distiguish between the first two on the basis of spills alone, but it will be one of those four locations...

This may help: Fabia I - Rear Wiper Issues Read ap0gee post, it's no 11.