MOT passed today with a couple of advisories.

Discs all marked for check at next service, usual one for having a childseat fitted and not testing the belt, number plate damaged (pressure washer too close or bird strike I can't remember) and a slight problem with
"Wipers not returning to stop on intermittent wipe" and
"Front washers inoperable - pump and fuses ok, possible faulty switch or relay".
Wipers just keep wiping, or when you stop they stop exactly when you stop them.
Now they worked fine yesterday in the rain on the A11, but have done the above occassionally in the last year and definitely during the last frosty cold snap.

As it's intermittent I can believe the service technician, but where are the switch and relay for checking please? This would be about the fifth relay if that's what it is.