Often admins put a comment on the movie page when they reject something, but not always indeed.

About the mk2, we have a few 1981 models listed as "Maxi 2".
But indeed these 1971 models and later should not have the mk2 at all, as it was not a new model, just a small restyling of the original one I suppose. I'll remove that.
Usually that "mk" field is used for different model generations sharing a common name.