Over the years I have read in Motor Sport your strictures on the rear-vision mirrors as fitted to Rover cars, varying from "I dislike the diminishing type rear-view mirror" in the October, 1961, issue to "The framed rear-view mirror is of the highly dangerous 'vanishing' variety" in the December, 1966, issue.
I own a 1957 Rover 105S, which is equipped with a diminishing-type mirror, and frankly I wouldn't be content with any other type. Perhaps the diminishing variety takes some getting used to, but it gives a far wider field of vision than the flat variety, hence surely cannot be dubbed "highly dangerous."
Takaka, New Zealand. F. H. E. King,