Lee and Herring's TV show Fist of Fun would later make several references to their feud with Marber, calling him a "Cornish curmudgeon".

A stage version, directed by Michael Grandage, was first performed 2003 at the Donmar Warehouse, London by Kelly Reilly, Richard Coyle and Helen Baxendale.

A film adaptation, written by Marber, was released in 2004, directed by Mike Nichols and starring Julia Roberts, Jude Law, Natalie Portman, and Clive Owen.

In Howard Katz, his next play, Marber presented very different subject matter: a middle-aged man struggling with life, death and religion.

A play for young people, The Musicians, about a school orchestra's visit to Russia, was performed for the National Theatre's Shell Connections programme in 2004, its first production being at the Sydney Opera House.

[13] He also co-wrote the screenplay for Asylum (2005), directed by David Mackenzie, and was sole screenwriter for the film Notes on a Scandal (2006), for which he was nominated for an Oscar at the 79th Academy Awards.

[15] In 2016 he directed a revival of Tom Stoppard's play Travesties at the Menier Chocolate Factory in London which, after a sell-out run, transferred with the same cast to the Apollo Theatre in the West End.

[22] He directed Alan Bennett's Habeas Corpus from 3 December 2021 to 26 February 2022 at the Menier Chocolate Factory; the run was also delayed because of the COVID-19 pandemic.