Sir Quiller, I would challenge the claim that the MVM was the only car ever attempted to be made on the island of Guernsey as I seem to recall a nasty GRP-bodied MG TD replica being built on Guernsey in the early 1990s, with a plan to inflict it on a poor, unsuspecting public. Mercifully I don't think it ever got beyond the prototype stage.
I will try and find proof of this, which might take me a while, but I do remember it appearing in a British motoring magazine c.1992-ish. Watch this space!