Certain rare raw materials which were found in some important Mycenaean centres, such as amber and certain artistic interactions show that the Mycenaeans had sporadic contacts with North Europe, Britain and the Baltic countries. The presence of the Mycenaeans in these faraway countries provoked mainly the quest of ores, particularly gold and tin which do not occur on mainland Greece.
So What If...The Mycenean's would had aestablish long lasting and Independent colonies in(Around Cornwall) Britian before their fall about 1100 BC?