Although the series was completed, the BBC held back broadcast in 2019 because it was felt unwise to show an historical drama presenting a political scandal during national election campaign. The series was moved from summer to autumn schedules. With the British general election finally called for December 12 2019, the series could finally be scheduled for the New Year season.
Partly filmed in Bristol and Bath.
Producer Kate Triggs was asked why the iconic first meeting by the protagonists was not filmed by the actual (still extant) pool at Lord Astor's former Cliveden House, but at a villa in Spain. She replied: "We couldn't do it at Cliveden because it's now a luxury hotel and it was too expensive". It was where Meghan Markle spent her last night as a 'commoner'.
Ben Miles and Emilia Fox also appeared together in Catherine Cookson's The Round Tower (1998)
Ellie Bamber's birthday is 2 February. This is the same day Christine Keeler quotes as her own birthday in her autobiography, The Truth At Last.