Prominent businesswoman Gina Miller has called for the resignation of the men accused of endorsing a secretive, male-only charity dinner for Britain’s business elite that has sparked outcry over the treatment of women working at the event.

The dinner, held at the prestigious Dorchester Hotel in London’s upmarket Mayfair district last week, was attended by 360 wealthy businessmen from the worlds of finance, media, politics and the arts, according to a Financial Times investigation.