A bit of a stretch just disconnecting wiring Doug, for many testers I would imagine. Rules are if it's there it should work so complete removal only.
I agree Richard, but I saw that in more than one place when I googled. It seems to be based on the fact that the third brake light is not a legal necessity, unlike the normal brake lights. However, I can see the arguments developing with the MOT tester!
As a side, human nature is interesting, is it not?
We have some who spend lots of money improving their headlights, not just to see where they are going but so often said, to improve the chances of being seen by other road users.
On the other hand, a device already fitted on the rear to improve the chances of being seen when you brake…get removed.
No criticism; just saying. 🤔
