Nationality – British nationality. The claimant Argentinian national sought judicial review of the defendant Secretary of State's refusal of his application to be recognised as a British citizen on the basis of his maternal grandfather's British citizenship. The Administrative Court, in dismissing the application, held that, on the proper interpretation of s 4C of the British Nationality Act 1981, the claimant was precluded from claiming entitlement to British citizenship, regardless of any evidence as to whether his mother would hypothetically have registered him in the year after his birth.