DNA is a banned subject on Historum. Too few people understand it, and it tends to generate unresolvable conflict.No, celtic is not an ethnic british identity. It's a culture which has it's origins in south germany and spread through europe. Britons were just certain groups of R1b people who's origins are in the steppes of russia, mixed with the G neolithic farmers who's origins were from anatolia present turkey, who were mixed with some european mesolithic hunter gatherers. There were migrations of R1b people from iberia to ireland too, but english neolithic people were for sure completely replaced by bell beakers from netherlands, and it's proven by dna.
And all germanic peoples have their earliest origins in southern sweden where germanic culture was born.