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I think he’s half from Sussex half from Essex? (He can correct me). I doubt there’s any different genetically, more of a historical difference with east Anglia being a separate kingdom to Essex, Kent, Sussex (SE England) and with east Anglia being founded by Angiles and the latter kingdoms mainly by Saxons. Essex is grouped as part of the east of England in 2021 for statistical purposes but is historically part of the SE of England not east Anglia.
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