h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

It appears that there have been a number of migrations from Devon to South Wales.

According to the following link, there was a migration from Teignmouth to Tenby in the 17th Century, which helped rebuild that town (refer Angela Marks' posting)

There was also a migration of people from North Devon in the mid 1850's.

http://archiver.rootsweb.ancestry.com/th/read/DEVON/2012-03/1331424385

The earlier migration is perhaps the most surprising, as it is a much greater distance, and fishermen rather than miners from worked out tin and copper mines.

The following site gives some possible reasons why Devonian fishermen migrated in the 1600's ( refer earlier posting).

http://www.bbc.co.uk/legacies/immig_emig/england/devon/article_1.shtml

It appears that Devonians had a long history of fishing (and basing themselves) in other countries. In the 1600's politics and economics may well have been the reason for a diaspora of Devonians to Wales, Ireland, Newfoundland ..and beyond.

In the 1850's they were followed by many from the mining industry.