Super producer Mark Ronson has scrapped plans to record a theme song for the forthcoming James Bond film, because collaborator Amy Winehouse isn't fit enough to focus on music.

Last month, Ronson confirmed he had started work on a track for the superspy's latest outing, and had roped in the Black To Black star to lay down her vocal talents in his studio in Oxford, England.

But the celebrated DJ has hit out at the star's recent return to erratic behaviour, insisting troubled Winehouse is simply not "ready" to work on music while she has still not dealt with her demons.

And Ronson believes Quantum Of Solace bosses will have to hire other musicians to come up with the movie's title track, claiming it would be a "miracle" if he and Amy ever completed their joint effort.

He explains, "We did work on it (Bond theme) but we never finished it. I don't think it will happen unless by some miracle it gets recorded and someone sings on it."

Ronson adds, "I'm not sure Amy is ready to work on music yet."

However, a representative for the troubled singer refutes Ronson's claims that the fruitless recording session was down to Winehouse's hellraising ways, blaming it on the pair envisioning different directions for the venture.