UK prime minister Boris Johnson has never been under more pressure after revelations emerged that he attended a party during Covid-19 lockdown in 2020.

The news came a month after accusations about breaches of Covid rules at Downing Street first emerged, embarrassing the Conservatives.

Johnson may hang on, but "the magic is gone" says London editor Denis Staunton - and it may not be long until Tory backbenchers decide it is in their best interests to find a new leader.

If Johnson goes, who will replace him, what will it mean for Brexit, and how will his time as PM be remembered?

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