I agree with not trying to spend £64, but the time taking the bumper off, then back on again and finding resealing the nozzle doesn't work. I'd rather just replace it and walk away. I'm not rich but time is more precious (i.e. I don't have much spare time)!
I've checked the pipe and it seems fine. There is washer fluid on the unit and its constantly dripping, so almost sure it's that.
How do you raise the nozzle to take the cover off? Do you just keep on washing the screen and get someone to grab it when is raises or can you gently pry it up?