Sidaway has been a familiar character actor since the 1970s, notably playing Brenda Taylor in the ITV soap opera
Coronation Street between June 1990 and November 1992. She had previously appeared in the soap twice with cameo roles in 1976, as Mrs Briscoe, and again in 1982 as Mrs Fletcher. In 1995, Sidaway played Hill the housekeeper in the BBC adaption of
Pride and Prejudice in 1995, and the court usher Dee Yearwood in the BBC courtroom drama
Accused in 1996.
Written in Blood as Mrs Bundy in 1998, ''Death's Shadow
as Mrs Bundy again in 1999 and Judgement Day'' as Mrs Foster in 2000. In 1999, Sidaway played as Marge Beake in a one off ITV drama,
Hunting Venus, the mother of Charlotte (formally known as Charlie) after Simon Delancey, played by
Martin Clunes, enquirers on the whereabouts of Charlotte. In 2001, she was cast as Mrs Dorothy Barker in the ITV prison drama
Bad Girls. Between 2016 and 2019, Sidaway played Maureen in the BBC sitcom
Mum. Sidaway's other television roles include parts in
Lovejoy,
Casualty,
Doctors,
Holby City,
Heartbeat,
Andy Robson,
Miss Marple,
All Creatures Great and Small,
Jeeves and Wooster,
The Bill,
The Vicar of Dibley, ''
Foyle's War, The Inspector Lynley Mysteries, Doc Martin, Survivors,
and Being Human.'' ==Film roles==