You could weld 2' long razor-sharp spikes to your bumper and it would pass an MOT as the spikes weren't sharp due to corrosion or damage.
An MOT doesn't mean it's legal under construction and use law.
think you would find it would fail if you had spikes sticking out the front or rear, sure theirs something in the mot about how far things hand out (including the exhaust)
my lenses are E marked, and if its passed the mot with them fitted then its legal and goood enough for me, never had no issues from the police or anyone, all good for me so i cant complain