Ping
So why did the farmer bury his stuff like that? Well, a clue might be the ARRIVAL of some people from Galicia in Northern Spain. Although the main leadership elite of the Celts who came to dominate Galicia didn't arrive until about 700 BC (the Milesians) that area had been a jumping off place for advanced Black Sea/Mediterranean Celts and their leather boats for a couple of hundred years.
I suspect they went on raids for red haired women or something (maybe tin).
The Galician version of the Royal Annals is very consistent with this dating ~
Worth noting that Essex/Wessex/Sussex/etcsex/exes ~ whatever they want to call it, originally had a Celtic name that derives its structure from a Celtic language that went extinct in the Early Middle Ages, but which was commonly used among the Mediterranean "seafaring" Celts.
No doubt it had some other name before the Milesians arrived but we don't know what that might have been because they forgot to write it down because they were totally illiterate at that time.