Topic summary
British citizenship

Extracted from the Wikipedia article British nationality law.
British citizenship
Prior to 1983, everyone born within the British Islands (the United Kingdom and Crown Dependencies) received British citizenship at birth regardless of the nationalities of their parents. Individuals born afterwards only receive citizenship at birth if at least one parent is a British citizen or considered to have settled status in the UK. Section 2 of the Act establishes that adults born overseas are British citizens by descent if either parent is a citizen otherwise than by descent, subject to regulations. Section 3 of the Act establishes also that minors may be entitled to be citizens by registration if a parent is a citizen by descent who lived in the UK for a period before the birth. Adopted children are treated as if they were naturally born to the adopting parents at the time of adoption. Children born abroad to members of the British Armed Forces or British citizens on Crown service are treated as if they were born in the UK.