Help! 2005 SE Windscreen wipers suddenly do nothing!

I am selling my 2005 SE Micra (I have people coming today) and the windscreenwipers stopped working yesterday.

They do nothing, don't even jiggle or try to move. Washer works, rear wipers and washer works so I'm struggling to figure out the problem.

I have people coming today so I really don't have time to book into a garage!

Any advice would be great, the manual hasnt been at all helpful.