The Halcyon is a British television period drama broadcast on ITV which began airing on 2 January 2017.

[10] Croucher called The Halcyon "a similar beast" to Downton Abbey, although Left Bank Pictures founder and managing director Marigo Kehoe explained that the show had been in development "for a long time", and the development of the show came at a time when "new ideas were needed".

[9][10] The cast was officially announced on 4 April 2016, with the news that Olivia Williams and Steven Mackintosh would star in The Halcyon.

[14] A cover of the song "Marvellous Party" performed by UK soul singer Beverley Knight was released as part of the series' soundtrack.

[17] The Chatham Historic Dockyard in Kent was used in episodes 5 and 6 for scenes depicting bombed London streets.