Victoria McCloud, a retired High Court judge, said she would bring “one or more cases” against Prime Minister Keir Starmer’s government, accusing it of breaching the European Convention on Human Rights.

Earlier this month, Britain’s top court handed down a landmark ruling that gender and sex were defined by a person’s sex at birth in the country’s anti-discrimination laws.

The government has embraced the ruling and said trans women should use men’s facilities and vice versa, with Britain’s equality watchdog announcing interim guidance along the same lines.