Evening Alan and welcome to the Club
Screenwash problems are usually caused by gunky building up in the tank and probably in your case blocking the lines from the tank to the nozzles. Use a pin or similar to ensure the nozzles are unblocked then pour boiling water into the water tank and try to operate the washers. Hopefully the hot water will disolve the gunk and help free the lines. If this doesn't work you will have to try more drastic measures and disconnect the hoses from the nozzles and try and blow down the lines to see if you can clear any blockages that way.
Also, the filter in the tank itself may be blocked near the pump even if the pump itself appears to be working fine. Remove the front bumper for a propper look but you can get access from the offside wheel arch liner too.
Hope that helps for starters
EDIT: Also, pay attention to Phil. He knows things too and can type faster than me
