Requirements towards the candidate-adopters as per the legislation of the United Kingdom:
England, Wales and Scotland have identical requirements: Both married couples and single candidates can apply for adoption. If permitted by the legislation of the sending country, cohabiting couples or couples living in a registered partnership (including same-sex couples) could apply for adoption. The minimum age for candidate-adopters is 21 years. There is an additional requirement for the candidates to have been living on the territory of the United Kingdom for at least a year before filing the application for adoption.
Northern Ireland has the same requirements for the family status and the age of the adopters, with the only difference being that in Northern Ireland cohabiting couples or couples living in a registered partnership (including same-sex couples) are not allowed to apply for adoption.