Alcock played the prisoner Julie Saunders in all eight series of the television drama series, Bad Girls[3] and Agnes Clarke in The House of Eliott.
[4] In January 2012, Alcock was cast as Lorraine Stevens (née Salter), the ex-prostitute mother of Mandy Salter (Nicola Stapleton), in the BBC soap opera EastEnders,[5][6] reviving the role from Linda Henry, who starred as Salter until 1992.
[7] Alcock appeared in the 2009 Easter Special Doctor Who episode titled Planet of the Dead, playing Angela Whittaker alongside the Tenth Doctor (played by David Tennant).
She also appeared alongside the Sixth Doctor (played by Colin Baker) on the Doctor Who Lost Story audio titled Power Play, playing Marion Tudor (who disliked being called "Mary"), a leading protester against a controversial nuclear power plant.
She is also known for playing Carol in all five series of the BBC's BAFTA-winning sitcom People Just Do Nothing, [8] dinner lady Val in Alan Carr's semi-autobiographical sitcom Changing Ends for ITV, [9] and as Sue in Sky's sitcom Mr Bigstuff alongside Danny Dyer and Ryan Sampson.