14-07-15, 03:12 PM
MOT manuals are published online here: https://www.gov.uk/topic/mot/manuals
Motorbikes are here:
MOT inspection manual for class 1 and 2 vehicles: http://www.motinfo.gov.uk/htdocs/m1i00000001.htm
Lighting section: http://www.motinfo.gov.uk/htdocs/m1s01000201.htm
Subsection text:
Quote:Twin headlamp systems:On twin headlamp systems only one or both headlamps may need to be illuminated for either dipped or main beam. Each headlamp that can be illuminated on dipped beam must meet the requirement for dipped beam headlamps. Twin headlamps must be mounted either one above the other or symmetrically without regard to any sidecar and not more than 200mm apart measured from the edge of the reflecting surface. The tester should advise if both headlights should illuminate for eitherfunction and only one does so.
So very clearly, two headlight setup are legal and normal.