In March 2008, Sean appeared as Paddy's
gay twin brother Noel in
Shameless, however in a trick to viewers, Noel was credited as being played by Neil Grades, an
anagram of Sean Gilder. On 3 April 2008, he appeared on ''
The Paul O'Grady Show alongside fellow Shameless'' star
Alice Barry, who played
Lillian Tyler. In January 2014, he was Bosola in
The Duchess of Malfi, playing opposite
Gemma Arterton in the inaugural production at the
Sam Wanamaker Theatre. In June 2017, he appeared in the third series of the
BBC drama
Poldark, as Tholly Tregirls. Gilder appeared in the National Theatre production of
Dear England in various roles in the England football team including Physio Phil, and managers
Sam Allardyce and
Fabio Capello. ==Personal life==