WCollins,
As far as I'm aware an engine shutdown is not part of the MEP(Land) class rating revalidation, or part of the skill test either, for that matter. I tell my students for the rating that having covered it in the course of flying training it will not be covered in the skill test. None of them have come back to me afterwards and said that it was.
In fact, as I recall, part two of the form used for the MEP(Land) class rating application (where the flight training and test profiles are recorded) may have the engine shutdown blanked out for the flight test. Un fortunately, I don't have one to hand.
Having said that, things change. For example, I believe, rejected take-offs are now part of the fight tests for both single and multi.
Don't take my word for it though, give Gatwick a call or look at their website.
Regards, GT.