Mission accomplished, eventually. The rain went off for long enough for me to finish the job, and get the footwells and mats vacuumed and the interior given a wipe over.
Behold, Caliban, now with added attitude. I think it suits him.
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My fangs came just as bare plastic, with a reel of "M" supertape (not 3M) for me to manage as best I could. I just stuck most of the reel in appropriate-looking places and it all seemed to stick all right.
Actually I think this mod is the absolute bees' bollocks.