[4] She studied at the Royal Academy of Dramatic Art and made her professional début in weekly rep at Colwyn Bay in 1937.

[3] After two further West End roles she joined the Old Vic Company at the New Theatre for the 1948–49 season, playing Valeria in Coriolanus, Bianca in The Taming of the Shrew, Maria in Twelfth Night, Covetousness in Doctor Faustus, Mrs Marwood in The Way of the World and Dunyasha in The Cherry Orchard.

[3] When the Old Vic company returned to its home – rebuilt after wartime bombing – in 1950 she again played Maria in Twelfth Night, and later in the season appeared as Grace Wellborn in Bartholomew Fair, Alice in Henry V and Chrysothemis in Electra.

[3] At the Arts Theatre in June 1952 Jameson played Maggie Hobson in Hobson's Choice, after which she joined the Bristol Old Vic company, where her roles included Lady India in Ring Round the Moon, Mariana in Measure for Measure, Kate Hardcastle in She Stoops to Conquer, and Doll Common in The Alchemist.

[5] Returning to the Old Vic in 1959, she played the Wife in Sganarelle, Elmire in Tartuffe, and Agatha Posket in The Magistrate opposite Michael Horden.

To mark the Shakespeare quatercentenary the British Council sponsored the company, which included Julie Christie, Alec McCowen, Ian Richardson, Diana Rigg, Paul Scofield and Michael Williams, for a 16-week tour of Europe, the US and Canada.

In the mid-1970s she joined the Prospect Theatre Company, together with Dorothy Tutin, Timothy West and Derek Jacobi, in plays including A Month in the Country and A Room With a View.