The guidance, available on the UK government's official website, covers two main groups: those born on or after 1 January 1983 and those born before that date. The UK has explained its citizenship by birth rules. Photo Credit: Christopher Furlong, Richard NewsteadSource: Getty ImagesWho gets citizenship by birth automatically? In a related story, Legit.ng reported that the UK had explained how children born abroad can get British citizenship. Residency requirement for UK citizenshipMeanwhile, Legit.ng previously reported that the UK had explained how long foreigners must live in Britain before seeking citizenship.