A lot of people have reservations about the upcoming Mary Poppins sequel, and one of the stars of the original is equally unsure.

Dick Van Dyke played 'cockney' chimney sweep Bert in the Disney classic, and he and the original magical nanny Julie Andrews have been tipped for a return in the follow-up, Mary Poppins Returns.

"I'd have to see the script," he told The Mirror.

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"Without Walt Disney, and the Sherman brothers to write the score, and Julie, it will be difficult, I think.

"Every day we came to work and we knew there was something magical going on. There was such a spirit.

"Walt was always there as a morale builder. We both said we were children looking for our inner adult - Walt was such a big kid.

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"Sequels are traditionally not as good as the first. But I wish them well."

Not for the first time, he also addressed that cock-er-knee accent, once again placing the blame at the feet of his voice coach.

"They only sent a coach to me once for that accent," he explained.

"And he was an Irishman - his cockney accent was not much better than mine."

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Emily Blunt will play Mary Poppins in the sequel with Hamilton's Lin-Manuel Miranda also to star.

Meryl Streep could reunite with her Devil Wears Prada co-star in the sequel too.

Mary Poppins Returns is set in Depression-era London and sees Mary return to the grown-up Banks children to help them once more, this time following a family tragedy.

The film is set for release on Christmas Day (December 25) 2018.

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