The BBC is facing a possible investigation by a UK human rights watchdog over its treatment of Carrie Gracie, who resigned as the broadcaster’s China editor on Sunday citing a “secretive and illegal pay culture” that systematically discriminated against women.

The Equality and Human Rights Commission, which has a mandate to challenge discrimination, said on Monday it was writing to the broadcaster seeking information on its pay policy and “the facts in this individual case”.

“We will consider whether further action is required based on this information,” it added. “The new duty [on employers] to report on gender pay gaps from April is likely to expose more instances of unequal pay. All employers have a duty to do more to end discrimination and ensure they fully comply with equality law.”