[5] Her credits include Agatha Christie's Poirot, Dalziel and Pascoe, Tipping the Velvet (with Rachael Stirling) and Judge John Deed.

Her stage appearances include Kate Hardcastle in She Stoops to Conquer,[10] Regan in King Lear[11] and Masha in The Seagull,[12] the latter two with Ian McKellen.

[13] Dolan played British serial killer Rosemary West in the ITV drama Appropriate Adult in 2011, receiving critical acclaim and a BAFTA TV Award for Best Supporting Actress.

[17] In 2016, Dolan appeared as Janet McIntyre in the BBC two-part drama The Witness for the Prosecution, an Agatha Christie play adapted for television by Sarah Phelps.

[18] In 2017, she made guest appearances in Catastrophe, Death in Paradise and Strike, whilst also writing and starring in her debut one-woman play, The B*easts at the Edinburgh Festival Fringe.

Later that year, she portrayed Marion Thorpe in the critically acclaimed miniseries A Very English Scandal, receiving her second BAFTA nomination for Best Supporting Actress.