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- Coronavirus pandemic
image copyrightPA Mediaimage captionPubs have been forced to close as part of England's national lockdown
The next two weeks will be "absolutely crucial" if England's lockdown is to end as planned on 2 December, a government scientific adviser has said.
Prof Susan Michie said the public must resist breaking the rules in order to "be in a position" to spend the festive period with loved ones.
News of a potential vaccine would make "no difference" to the current wave but could lead to complacency, she added.
The prime minister has said the current restrictions will "expire" next month.
Prof Michie, a member of the Scientific Advisory Group for Emergencies (Sage), told BBC Radio 4's Today programme it was too early to know what should replace the measures when they end, with the coming fortnight being key.
She said: "They're going to be a very challenging two weeks, partly because of the weather, partly because, I think, the promise of a vaccine may be making people feel complacent."
But she said data showed adherence to lockdown rules had been "pretty steady since the summer".
Pubs, bars and restaurants as well as non-essential shops have been forced to close during the four-week lockdown in England.
Boris Johnson has previously insisted the measures will end as scheduled but Cabinet Office minister Michael Gove has said measures could last beyond 2 December.
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Prof Michie said people had to "get their resolve together" and resist any urge to break the rules, in order to maximise the chance of leaving lockdown.
However, she said she was "quite hopeful" after tough measures in Wales and Northern Ireland brought transmission rates down.
Wales finished its 17-day firebreak lockdown restrictions on Monday. Much of Northern Ireland's economy was placed under tight measures on 16 October.
Scotland introduced a four-tier system on 2 November after ending national curbs on the hospitality industry. Areas in the west of Scotland have been warned they may be placed under the highest level of restrictions next week.