My rear washer has decided to stop working. I've had a good go at the nozzle with a pin, so I'm fairly confident that there's no blockage. Can anyone suggest how to investigate the pipe? There are no suspicious puddles left in the boot when I try to use the squirter, and the motor is audible, so presumably (!) it's working properly.

How did we live without rear wash-wipes? Five minutes on a moist motorway and I'm down to the door mirrors.

Check the connection in the engine bay at the left hand bulk head, if the car has ABS it will be behind the ABS unit and can be tricky to re-connect, the next connection is at the left hand rear wheel arch and the last one at the motor. I saw one last week where all three connections had come apart.