[2] Thomas trained at Middlesex Polytechnic, graduating with a BA(Hons) in Performing Arts in 1989.
From 1994 to 2004 she was musical director of fringe theatre company,[3] The Steam Industry with productions including Seven Brides for Seven Brothers, The King & I, The Sound of Music and the UK stage premiere of Calamity Jane, all at Battersea Arts Centre (BAC).
[5] Thomas has written the music and lyrics for almost 50 musicals including: Thomas also wrote the music and lyrics for the following pantomimes with the book by Daniel O'Brien: Cinderella (2007), Puss in Boots (2008), Jack and the Beanstalk (2009),Aladdin (2013), Beauty and the Beast (2014), Robinson Crusoe (2016), Mother Goose (2017), Robinson Crusoe, Dick Whittington and his Cat (2019), Covidella and the Masked Ball (2020) an online production and Jack and the Beanstalk (2021).
[25][26] As an accompanist, Thomas has worked with Maria Friedman, Liz Robertson, Patti Boulaye, Rachel Tucker, Mari Wilson, Diane Langton and Peter Polycarpou, amongst others.
Launched by Mark Shenton in The Stage in July 2016, by December of the same year 115 major arts organizations had signed up.