BBC
The Mayor of London, who featured in a cameo scene with Windsor's character Peggy Mitchell this month, spoke out on his Twitter page after hearing the news yesterday.
Addressing his followers, he commented: "Tragic news about Barbara Windsor leaving EastEnders!"
Windsor has announced that she is to leave Albert Square next year because she wants to spend more time with her husband. However, she is not planning to retire from showbiz completely.
Johnson's recent appearance on the soap saw him meeting Peggy in the Queen Vic while on a trip to Walford.
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