Interesting question...was wandering the same thing.
My Dr 350 is an enduro bike, and as such comes with no lights etc., but as I do need to ride it on the road at times, a brake light/horn/number plate has been fitted (common mod amongst off-road riders). The bike passed its MOT, with the examiner writing on the ticket that it was daytime use only.
So...if my 748 passes its MOT with all light etc in place, (ie full MOT) is it legal for me to remove the headlight and ride with my track fairings on the front of the bike during daylight?
mmmmmmmh?