Yes Paula, she does.

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Ms Duff, an accomplished stage and television actress, has been taking music lessons to prepare her for the role.

Looking the part in a grey 1950s-style dress, she said: "I'm learning to play the banjo and I love it.

"It's much more difficult than I expected but it's always great to have something external that connects you with a character."

Warning spoiler for those not familiar with John Lennon bio.
http://www.liverpooldailypost.co.uk/liverpool-news/regional-news/2009/03/13/filming-of-new-john-lennon-bio-pic-nowhere-boy-begins-in-liverpool-92534-23135049/