Brighton council is facing a by-election after one of its Green councillors quit over the weekend.
The local authority is already a hung council, with the Green leader Jason Kitcat blocking a move to replace him last week.
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A minute's silence will be observed at 11am on Thursday in remembrance of those who lost their lives in the Manchester Arena attack.
Today is the final day of Government consultation on a third Heathrow runway but the airport's biggest user has opposed the current plan.