For MOT front fogs are not a testable item, neither are inner spots like on sapphy headlights, so long as the main light works on main the inners don't need to, and won't cause a fail.
The spare doesn't need to be "legal" for the MOT as this is not what the MOT is testing, BUT it does have to have suffecient tread etc just like the tyres on the car, taking it out is ok, so long as the mot is not started, as when it is NOTHING can be done to the car other than the test, so if tyres there it needs to be right but doesn't need to be there.
Beware if you have a sat nav on your screen it is a failure, due to obscured vision, and the tester is NOT allowed to remove it, same as any sticker/banner that is within swept area of screen.
A car can pass the MOT and still be illegal as these are seperate and different rules.
tabetha