I had my trackbike “daytime” MOT’d.
Just needed horn and a speedo (it was a newish bike). If yuo have a light, you have to have them all that were fitted at the time the vehicle was first registered. You cannot opt for a brake light alone. All or nothing. Indicator need depends on the age of the vehicle.
Strictly speaking it should have failed the test as I’d left the switch gear on the bike as it was a right faff to remove it as the kill switch was part of the assembly.
Of course, complying with the construction and use reg is another matter. I never felt really happy using it on the road in case it broke down, (a real possibilty with a Laverda) and I was kept out after dark, or a zealous police office stopped me and went over the bike with a fine tooth comb.
Still, it was OK for the odd Sunday morning blast for an hour or so.