When would another lockdown in England start?
If another lockdown were to come into force, it would almost certainly be post-Christmas.
The Government has committed to plans to let people travel wherever they like regardless of tier or local restrictions across the UK.
New figures from the Office for National Statistics suggest half of adults across the country are planning to form a Christmas bubble.
The survey, carried out between December 10 and 13, before Mr Johnson urged people to scale back their festive plans, also found that fewer people are planning social activities such as meeting in pubs, cafes or bars, compared with last year.