Personal line interiors were available from Club spec upwards, so any Club or Club SE orders would have come with speckle velour trim as standard (rather than leather).
I guess most people who had the available funds to spend on a PL interior would have been ordering Connoisseur or SE spec, hence the cloth seats are indeed very rare. I can only remember seeing one other set in Aubergine, in a black saloon in a Cornish scrap yard many years ago.
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