General Register Office for England and Wales

The General Register Office for England and Wales (GRO) is the section of HM Passport Office responsible for the civil registration of births (including stillbirths), adoptions, marriages, civil partnerships and deaths in England and Wales and for those same events outside the UK if they involve a UK citizen and qualify to be registered in various miscellaneous registers. With a small number of historic exceptions involving military personnel, it does not deal with records of such events occurring within the land or territorial waters of Scotland, Northern Ireland or the Republic of Ireland; those entities' registration systems have always been separate from England and Wales.

Source: Wikipedia — General Register Office for England and Wales (CC BY-SA 4.0)