Stream of consciousness rationale: The relevant information is: Jane and Michael flee the bank, getting lost in the East End until they run into Bert, now working as a chimney sweep, who escorts them home.
The question and answer pair are described below.
Q: Jane and Michael flee the bank, getting lost in the East End until they run into Bert, now working as a chimney sweep, who escorts them home. The three and Mary Poppins venture onto the rooftops, where they have a song-and-dance number with other chimney sweeps. Then, Mr. Banks returns home, receives a phone call from his employers, and speaks with Bert, who tells him he should spend more time with his children before growing up. Jane and Michael give their father Michael's tuppence in the hope to make amends.

Answer this question based on the passage: what is the chimney sweeps name in mary poppins?
A: Bert