Tori Amos' musical has been shelved indefinitely over fears it won't be ready to hit the stage in London in April.

"The Light Princess," an adaptation of a 19th century fairytale, was scheduled to open at the National Theatre next spring, but now there's no date for the production's bow.

A spokeswoman for the National Theatre says, "Development is continuing on 'The Light Princess' and we'll announce a new date for the production in due course."