Got my MOT booked for the 6th of May, and today I noticed my headlight washers dont appear to be working, I have tried with the lights on,

A) Will it fail the MOT if they dont work or just an advisory ?

b) My mate asked me to check if i can hear a motor when I try and work them, but of course the main window washer is going so I wouldnt be able to tell any difference, has the headlight washers got a seperate relay, if so does anyone have a pic showing it ?

Wont get back from work tomorrow till its pitch black so wont get to look until Saturday unless im called back into work, so just trying to check as many things before I take it for the test.. Thanks.