Both Hector and Mrs Lintott have the audience on their side whereas he – who is teaching and getting results, which, in the ordinary way, parents would approve of – is not thought to be sympathetic until he reveals himself as quite vulnerable.

[8] Reviewing the play for The Guardian in May 2004, Michael Billington wrote: "Stephen Campbell Moore makes Irwin both meretricious in his methods, yet effective in his results".

[9] In 2004, he starred as Lord Darlington alongside Scarlett Johansson in A Good Woman, based on Lady Windermere's Fan by Oscar Wilde, shot on location in Italy.

In the same year, Campbell Moore played the part of Hugh Stanbury in Andrew Davies' BBC adaptation of Anthony Trollope's novel He Knew He Was Right.

Stephen Campbell Moore catches perfectly the obduracy and awkwardness of Maurice Wilkins, forever tugging at his slightly too-long sleeves".

[14] An August 2018 announcement indicated that Campbell Moore would be among the new cast to join the original actors in the feature film Downton Abbey, which started principal photography at about the same time.