I am currently running my MGB with no mot until after I have renewed my tax mainly just to go through the re-taxing process with no mot…… Don’t ask me why?
If it fails on (only) emissions then I know that the rest of the car has passed and safe. I’m not happy about someone fiddling with the carbs after spending a lot of time getting them just right.
An interesting article from Hagerty about the subject below:-
MGB tips mods and maintenance 