Poppy trained at Italia Conti Theatre Arts in London and TVI Actors Studio in Los Angeles.

Theatre Credits: Evelyn in Absent Friends (Oldham Coliseum & UK Tour); Jackie Kennedy in First Lady Suite (Union Theatre); Poppy originated the role of Harley Quinn in Batman Live U.K and International tour. Mina Westerman in Dracula (Derby Playhouse), A season at the Pavilion Theatre (Dublin) which included: Juliet in Romeo and Juliet, Felice in Letters To Felice, and The Banshee in The Quest.

Musical Theatre Credits:  Lola, DAMN YANKEES! Landor Theatre, Director Rober McWhir; Candela, WOMEN ON THE VERGE OF A NERVOUS BREAKDOWN (WORKSHOP), Ambassador Theatre Group, Director Bartlett Sher; Lourdes, CHILDREN OF THE SUN (WORKSHOP), Director Tim Supple; Alexandra, WITCHES OF EASTWICK, The Watermill Theatre, Director Craig Revel Horwood; Svetlana CHESS (UK Tour), Director Craig Revel Horwood; Jane in THE WITCHES OF EASTWICK (National Tour starring opposite Marti Pellow); Mrs Cratchitt in A CHRISTMAS CAROL (Birmingham Rep); Guilletta Trapani in ASPECTS OF LOVE (National Tour starring opposite David Essex); Eliza Doolittle in MY FAIR LADY for Bronowski Productions in Kuala Lumpur; Eliza Doolittle in MY FAIR LADY, a No.1 Scandanavian tour for Mikkel Ronnow; The Alternate Mary Poppins in MARY POPPINS (Prince Edward Theatre); Leading Lady in OH WHAT A LOVELY WAR! (Derby Playhouse); Tess in TESS OF THE D’URBERVILLES (Savoy Theatre); Cosette in LES MISERABLES (National Tour); Philia in A FUNNY THING HAPPENED ON THE WAY TO THE FORUM (York Theatre Royal); Mary in SUNSET BOULEVARD (with Petula Clark, Adelphi Theatre); Giulietta Trapani in ASPECTS OF LOVE (Lincoln Theatre Royal); The Mistress in EVITA (National Tour); Jemima, Jellylorum & Gumbie in CATS (National Tour); Cover and played Ellen in MISS SAIGON (Drury Lane Theatre); Kat in OH! WHAT A NIGHT (Blackpool Opera House); Bridget in A SLICE OF SATURDAY NIGHT (Liverpool Empire); Snow White in LILLY SAVAGE'S SNOW WHITE AND THE SEVEN DWARFS (Manchester Opera House & Bristol Hippodrome); Sheherazade in SHEHERAZADE (Royal Academy) and Claudine in BERNADETTE (Dominion Theatre). 

Television Credits: Nun / Cover Baroness, The Sound of Music Live!, ITV, Coky Giedroyc; Sarah in AGONY, Charlie in HOOKED ON BOOKS, THE BILL, JACKANORY.

Film Credits: Margarita in BATMAN BEGINS (Warner Brothers).

Concert Credits: SOUTH PACIFIC at the Birmingham Symphony Hall (BBC Radio); SUNSET BOULEVARD at the Cork Opera House (BBC Radio 2); She has sung several times in FRIDAY NIGHT IS MUSIC NIGHT (BBC Radio 2) also POPPY TIERNEY'S MUSIC FOR A SUMMERS EVENING at the Pavilion Theatre (Dublin).