Most recently answered headlamp washers questions

My 2012 Audi A6 is using a lot of screen wash fluid. It has headlamp washers which I suspect are the culprits. Is it feasible (and legal) to disable them?

My 1996 Daihatsu Fourtrak is due its MoT soon and I've noticed that the headlamp washers don't work. Is this an MoT failure?
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