Britain Broke Away from Europe 450,000 Years Ago

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Clive Cookson, Scientists Find Proof of the First Brexit No One Voted for -- 450,000 Years Ago; Geologists have identified what they say was the most important event in a million years of British history -- when Britain first broke away from Europe. Financial Times, Apr 5, 2017 (front page).

Note:
(a) Gupta S et al, Two-Stage Opening of the Dover Strait and the Origin of Island Britain. Nature Communications, _: _ (online publication: Apr 4, 2017).
www.nature.com/articles/ncomms15101  
(b) Strait of Dover
https://en.wikipedia.org/wiki/Strait_of_Dover
(33.3 kilometres or 20.7 miles)