Thanks Planks - and Loge (#93, #94) - the old Greek had indeed deceived me as you suspected (timeo Danaos...
et dona ferentes...) I'd missed post #33 that would have put me right - and I'd also carelessly assumed that Jan Vermeer drew his home oft - silly me.
The nauseously twee 'boat-shaped napkin (serviette?) stands' were totally impervious to Google, Wiki, even Etsy (don't go there -
far worse than Mamma Mia) and my old Chambers CD won't work any more for reverse searching. But successive substitutions following your hint revealed the utterly useless word.
So now (c) has revealed itself. What now - not sure what to substitute with (c), and how - even if (c) is what it seems: there
was talk of a moor earlier, which could be encouraging, but Loge discounted it at post #59.
And in any case, what to do with the four clashing non-thematically-symbolic letters in 18 & 12? They form a thematically suggestive anagram?
I'm just muttering to myself, really, while hoping for the fourth or fifth PDM - but any subtle hints would be gratefully received.