Sally Ann Triplett — last seen in the West End when she took over as Miss Adelaide in Guys and Dolls in the Donmar Warehouse production at the Piccadilly in 2006 and subsequently seen on the fringe in the Menier Chocolate Factory production of Maltby and Shire's Take Flight — will become the newest actress to play the role of Donna Sheridan. Also joining the company are Katy Secombe as Rosie (with Jane Gurnett staying on as Tanya) and Norman Bowman and Christopher Hollis as Donna's former boyfriends, Sam Carmichael and Bill Austin (with Paul Ryan remaining as Harry Bright). Niamh Perry will take over as Donna's daughter Sophie. Also remaining in the cast are Oliver Hembrough as Sky, Jodie Read as Ali and Laura Selwood as Lisa, while joining afresh will be Ben Heathcote as Pepper and Sam McKay as Eddie.

Triplett, who has twice participated in the Eurovision Song Contest, representing Britain as a member of the six-piece band Prima Donna (in 1980) and as part of the double act Bardo (in 1982), has extensive credits in West End musicals, including runs in The Best Little Whorehouse in Texas, Chess, Follies, Grease, Jolson and Cats. She appeared in the original Stratford-upon-Avon and short-lived Broadway runs of the musical Carrie. In 2002 she starred as Reno Sweeney in the National Theatre's revival of Anything Goes, directed by Trevor Nunn, that subsequently transferred to the West End's Theatre Royal, Drury Lane.

Secombe, daughter of the late Sir Harry Secombe, appeared as Mrs. Paroo in the Chichester Festival Theatre production of The Music Man in 2008. She has previously appeared in the ensemble of Mamma Mia!, and other roles include Madame Thenardier in Les Misérables and appearances at the National Theatre in Mother Clap's Molly House, The Winter's Tale, Twelfth Night and Guys and Dolls.

Bowman was last seen in the West End in Michael Grandage's Donmar Warehouse production of Twelfth Night at Wyndham's Theatre, and has previously also played Sky Masterson in Grandage's production of Guys and Dolls at the Piccadilly. Other London stage appearances include playing coach Bolton in High School Musical and appearing in the London premiere of Parade at the Donmar Warehouse.

Hollis has made many TV appearances including "EastEnders," "The Bill," "A Touch of Frost" and "Brookside." Perry was a finalist on I'd Do Anything, the BBC1 reality TV contest in which she competed to play the role of Nancy in the current West End production of Oliver!

At certain peformnces the role of Donna will be played by Melissa Jacques.

To book tickets, contact the box office at 0844 482 5115 or visit www.mamma-mia.com.