The article notes that; but apparently Germany or the Iberian peninsula were producers as well.
Luckily, it's generally possible to determine the source of these metals based on the relative isotope ratios and such. You've got to figure they'll be checking on that, as the results would have significant implications.
Hi
I am a member SWMAG the team that found the Bronze Age wreck off Salcombe, in trawling the web to note the reactions of the press release. I find there are many questions from people who are interested. One of them is the testing of the copper and tin ingots and of course the gold items. We have been quoted extrordinary prices for this to be done by the ‘experts’, one day we will find some one who can nail down the origin of these metals which is so important in telling the story of these wrecks. ( we have found two some 150 metres apart, one 900 BC and one 1500 BC) Adjacent to the older Bronze Age wreck is the original 17th Century site that started it all. You can see it is an expensive business for an amature team like ouselves. So at the moment its all theory.