In September 2016 Ebay seller marisaland (aka ismaa3) from El Soto and La Fresneda in Spain was selling these St. Helena and UK (GB) diplomatic plates.
He says all of them are used and all of them were made in Spain. I am sure they were made in Spain but they have never been used. Both the diplomatic plates are still on the official cars in London with the Iceland and Vatican embassies.
If he wants to sell reproductions, he should say so and not try to fool collectors by claiming they are genuine.