Hi Nick, thank you for your reply.
I am already aware of both listings you have referred to, however the first seller says: "We have come across this design several times and while I am sure that it is Arabia or Iittala or someone similar I have yet to identify it." And the 2nd seller also cannot give a positive identification, maybe having seen the other seller's listing. Without a label or an i.d. mark (signature) it's conjecture. I was hoping to be able to find a site (or perhaps a maker's catalogue) which positively identifies this piece.
Thanks again Nick for your input, I will keep the search going for a positive identification and welcome any further information any member has to offer. Kind regards, Barry