I've had the seemingly rather common rear washer problem.
I've just been in the boot and got my hand down the trim behind the light cluster.
I can feel a load of water beneath the CD changer so I'm fairly confident the pipe has popped off down there.
I've read a few posts where people have had the same issue.
I figure I should fix it myself, especially if it's just a case of popping a pipe back on.
How hard can it be! ~famous last words....
Just how much trim do I need to remove though