Thank you everyone - looks like 8 of the 10 have been corrected, there's one it's suggested was right in the first place and there's only one left without comment so far ...
8: Llandecwyn on the Cambrian Coast
Anyone? I can tell you it's not Llananywhere, Cwmanywhere, Pontyanywhere or Aberanywhere ... I'll give the answer tomorrow - amazed no-one has placed it yet!