"I'm absolutely in love with Judy, and I feel very protective of her at the moment. The thing I think I'm most worried about is really giving people what they expect, because there'll be a lot of Judy Garland fans in the audience.
"For those who aren't fans, we're telling a sometimes funny, sometimes touching story of a woman with a serious addiction."
The play takes place in 1968 in a hotel room, where the once-glittering star is preparing for a string of comeback performances with her devoted accompanist, Anthony, and her new fiancι, Mickey.
"I know at times she behaved appallingly towards other people, but she had no idea of how to love or be loved because she was never shown. Her relationship with Anthony is one that she's comfortable with because he's just there to serve her. Even though he's a gay man, there's a lot of chemistry between them, and he's partly there to represent her love for her audience.
"With Mickey Deans, on the other hand, she has quite a volatile relationship, although she's very much in love with him. I think he loves her too, but as a frustrated musician, he's nonetheless aware of the opportunities that being married to her can bring him."
"I'm not allowing myself to say, 'Oh, it doesn't matter if you can't sing it, because she was at the end of her life'. I'm not taking that easy way out.
"I want to give the character as much depth as possible. It's important to say that this is a play with songs rather than a musical, so we're trying to tell a very truthful story that's wonderfully punctuated with all these moments where we see her in concert. I hope that people see her vulnerability, as well as how absolutely hilarious she was."
End of the Rainbow, which premiered at the Sydney Opera House in Australia in 2005, features Judy Garland's most memorable songs such as The Man That Got Away, Come Rain Or Come Shine, The Trolley Song and Somewhere Over The Rainbow.
End of the Rainbow runs at the Lichfield Garrick from Monday 16 May to Wednesday 18 May at 7.30pm.