"Archaeologists believe the copper – and possibly the tin – was being imported into Britain"
WHAT?
Who are these "experts"? It's incredible that they apparently do not know that Britain was a major source of both tin and copper at that time. Are we supposed to believe this was some kind of bronze age "coals to Newcastle"? This vessel would have been exporting not importing.
Something is not right. This message is just to keep things from messing up down the road