My rear washer is blocked and no water comes out when i hold the rear wiper stalk forwards.
there is water in the washer holderi nthe bonnet. Any ideas on how to fix?

Can you hear the pump running if so It may well be just the jet thats blocked a new one is a couple of quid, easy to check just unscrew the high level brake light fand then you will see the pipe, just pull it off the jet and get an assistant to hold it clear of the car and operate the washer if water comes out its the jet.