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The soap star, 37, also admitted she had difficulty shaking off the 'wiggle and giggle' of Dame Barbara's Carry On persona when playing her a second time, following 2017's BBC biopic Babs.
EastEnders has released new images teasing the Mitchell family's upcoming flashback episode.
The actress admitted she was 'scared' to take on the actress' iconic soap part in the one-off episode, after previously playing a younger version of Barbara herself in a BBC biopic.
The special episode will transport viewers back to 1979.
Viewers have been given a first glimpse of the Mitchell family in the upcoming flashback episode of EastEnders.