The American actor, who created and starred in Broadway's smash hit production Hamilton: An American Musical, is preparing to take on the role of a lamplighter named Jack alongside Emily Blunt as the magical nanny in Disney's Mary Poppins Returns, which is due to hit theatres in 2018.

DICk Van Dyke received ribbing from fans for his cockney accent as Bert the chimney sweep in the 1964 classic Mary Poppins, and New York native Miranda fears his London accent in the sequel will take that ire to new heights.

"I'm going to have the worst accent in the history of English accents - I’m going to sound like I’m from another planet," he laughed to USA Today. "I am really trying to manage expectations."

The 36-year-old adds that he is concerned moviegoers will be "furious" with him if he doesn’t manage to master the local dialect and joked that he intends to represent a "corner of London" where an accent has "not yet been invented".

Miranda relocated with his wife, Vanessa Nadal and son Sebastian, two, to London last month (Oct16). The extensive Mary Poppins shoot is expected to last through the first half of 2017.

And though he’s been "holed up" at home while he prepares, the star has had some time to explore the British capital, and has already walked through some of city’s famed parks and the Borough Market.

"So I'm happy about that. But I love being in a city with a really great subway system. I love taking the Tube. I love the parks. I’m soaking up as much of it as I can," Miranda added. "The fun for me is seeing the little things that are slightly different."

And he even claims to prefer the coffee, saying that the local brew is "just better" than what he drinks back home.