UK's Citizenship by Descent

2nd Generation Limit:+Parent: Automatic citizenship if a parent was born in UK+Grandparent citizenship can be claimed if at least one grandparent was born in the UK and either: The applicant's parent (child of the UK-born grandparent) was a British citizen "otherwise than by descent" (generally, born, adopted, registered or naturalized in the UK) at the time of the applicant's birth; or, The applicant's parent served in the UK armed forces at the time of the applicant's birth

General: Applicants must provide comprehensive documentation proving their lineage to a British citizen+This typically involves proving that at least one ancestor was a British citizen or held British nationality+Specific Documents: Birth certificates, marriage certificates, death certificates (if applicable)+As a general requirement, all the documents must be in English+Additional Proof of Lineage: In cases where standard records are unavailable, other documentation such as baptismal records, census records, military records, or immigration records may be accepted, but they must be officially substantiated+For all the documents issued outside UK an apostille is tipically required.

British ancestor must not have lost their British citizenship before the birth of the next generation in lineage.

Criminal Record: A clean criminal record is generally required. English Proficiency: if the applicant is not original from an English speaking country, United Kingdom may require applicants to take a language test to prove English proficiency