Born in Bolton, Lancashire, Dawson spent part of her childhood in Tanganyika, where her father worked. She attended the Elmhurst Ballet School and after training at the Central School of Speech and Drama she learned her craft by playing in repertory theatre companies.
Dawson went on to star in several West End musicals. She featured in episodes of Dixon of Dock Green during the 1960s, The Benny Hill Show during the 1980s, and played Hyacinth Bucket's sister Violet ("the one with the Mercedes, sauna and room for a pony") in the final series of the sitcom Keeping Up Appearances, though her character was only featured on screen briefly in four episodes.
Dawson was married to former Black and White Minstrel Show soloist John Boulter.

The Girl from Starship Venus
1975 · as Store Manageress

O Lucky Man!
1973 · as Becky

Bloodbath at the House of Death
1984 · as Nurse

Love Thy Neighbour
1973 · as Betty

If You Go Down in the Woods Today
1981 · as Courting Woman

Benny Hill - Unseen
1994 · as Various/Archive footage

Down at the Hydro
1983 · as Wife

Granny Gets the Point
1971 · as Boutique Assistant (uncredited)

Kenny Everett - The Complete Naughty Bits
2004 · as Carla

Stand up, Virgin Soldiers
1977 · as Glam

Gabrielle and the Doodleman
1984 · as Wicked Witch

Benny Hill's World Tour: New York!
1991 · as Self/Various Roles