The Hidden Hand Of The British Empire From Lincoln’s Assassination To The Iraq War

they did not settle in britain but england in middle of celts
https://en.wikipedia.org/wiki/Angles

by the way, english are not even celtic but "angles", "saxon"
https://en.wikipedia.org/wiki/Anglia_(peninsula)

england is not briton or british ... but celtic
https://en.wikipedia.org/wiki/Celtic_nations

notice english calling themselves "brits" ... to hide austria and germany,
britanny is in france
https://en.wikipedia.org/wiki/Brittany
https://www.theguardian.com/uk-news/from-the-archive-blog/2017/jul/17/british-royal-family-windsor-name-change-1917

after french revolution ... napoleo conquired europe and restored monarchy