Cornwall and south Devon 'originally part of mainland Europe'
Study reveals Britain acquired regions when struck by land
bearing what is now France, Ima Sample, The Guardian
https://www.theguardian.com/science/2018/sep/14/cornwall-and-south-devon-originally-belonged-to-europe
The open access paper is:
Arjan H. Dijkstra, and Callum Hatch, 2018, Mapping a hidden
terrane boundary in the mantle lithosphere with lamprophyres
Nature Communications. 9, Article number: 3770
https://www.nature.com/articles/s41467-018-06253-7
Yours,
Paul H.