Ann Penston, a friend of Gloria Foster who died after her care agency was closed down, says she wants to know how the tragedy happened.
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The accident happened on Clapham Road at lunchtime.
Tower Hamlets tops the league, with the population set to soar 25% by mid-2024.
Senior Tory Andrew Boff suggested the new mayor was backtracking on a manifesto pledge to build 80,000 homes a year.