The Baltic is not only low in salt (2 parts as against 35 parts per thousand for the ocean) but is also a bit parky for natural evaporative processes. Hence, the theory goes, why the Old Saxons with the salt mines in Saxony are also the New Saxons (of Anglo-Saxon fame) of the Baltic, with the Elbe in between to get it there.
We have been assuming that the Megalithc Brits used (indeed created) the salt marsh evaporation basins that are now called Poole, Portsmouth and various other massive (and unique) shallow harbours. However, there has never been a satisfactory explanation for the Somerset Levels so we can now provisionally assume that they too were artificial salt marshes.
All this effort to produce salt (we haven't even got on to the Biscay Bay production centres) suggests that salt was used on a much more massive scale than would be required for domestic use, even adding in for big time trade in salted foodstuffs. Given that we have already made a fairly major link between Megalithics and chalk (which is calcium without the chloride -- please check my chemistry, someone, I got grade H in my mocks and was told to do German instead, and got grade H in my actual German O-level) there may be something we've missed.
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