Sir Patrick Vallance has warned the next Covid variant could be worse than Omicron as the virus continues to evolve.
The Government's Chief Scientific Adviser said it is "a mistake" to believe the more Covid evolves, the less serious its mutations will become.
The Omicron variant spread rapidly across the UK in the run-up to Christmas when the R number was estimated to be around 1.3 which meant on average every 10 people infected 13 people.
