Ooops, I looked it up on Google, saw MK12, clicked the Wikipedia link which I now see is actually the MK10.  The MK12 links that came up are for dealers and so in the Milton Keynes MK12 postcode! Moral – don’t do hasty research on yer smartphone and if you do then read the links properly! ?

Suspect my brain was probably mixing the Mk10 and the XJ12…