Britt Allcroft was co-founder of "The Britt Allcroft Company" with then-husband Angus Wright, known as Britt Allcroft Limited (later replaced as Gullane Entertainment) which was sold and acquired by HiT Entertainment in 2002. Allcroft is well known for her creation of Thomas the Tank Engine and Friends and its US counterpart Shining Time Station. She was also the screenwriter and director of Thomas and the Magic Railroad, and even supplied the voice of Lady. She also created the television show "Magic Adventures of Mumfie".