After performing as a dance band vocalist and entertaining British troops during World War II, Webb pursued a career in West End musicals, becoming known for her vivaciousness in playing such roles as Lucy Willow in Bless the Bride, Linda in Ivor Novello's Gay's the Word and Sarah Brown in Guys and Dolls.

She married Colonel Guy Campbell, the heir to a baronetcy, and left the stage in the late 1950s, bringing up two sons but returning for a last engagement in the title role of The Merry Widow in 1969.

Webb was born in Reading, Berkshire, the last of three children of Frederick Holton, a locomotive engine driver, and his wife Ethel, née Strutt (1895–1926).

She was also a regular on programmes such as Happidrome, Workers Playtime, Kaleidoscope, "Music Hall", Variety Bandbox, Four and Twenty, The Forces Show with Diana Dors, Jack Buchanan and Bob Monkhouse, Follies of the Air with Sonnie Hale, Home at Eight with Hermione Gingold and Richard Attenborough, and Friday Night Is Music Night.

[4] Among the conductors she sang with were George Melachrino, Mantovani, Richard Tauber, Harry Rabinowitz, Stanley Black, Max Jaffa, Charles Mackerras, both Eric and Stanford Robinson and Vilém Tauský.

She first understudied and then took over the lead, Grace Green, in Vivian Ellis and A. P. Herbert's parliamentary satire Big Ben at the Adelphi Theatre in London and on tour (1946).

[4][5] Ellis and Herbert wrote a leading role for her the next year, Lucy Willow, in the hit musical Bless the Bride,[6][7] in which her character leaves a stuffy English fiancé, who she does not love, to elope with a brave and dashing Frenchman, played by Georges Guétary.

Webb continued to entertain the troops between West End engagements, in Austria after the war, in Korea in 1953 (while under enemy attack) and in Cyprus and Libya in 1956, where she met her second husband, who was head of the British military force in Tripoli.

[11] Webb effectively retired from the stage by the late 1950s to bring up her children,[9] although she continued to make guest appearances on radio and on television comedy shows of Charlie Drake and Dickie Henderson.