Have we had this yet? This was in a telegraph article this evening:
"Scientists at University College (UCL) London believe the rate as of Tuesday was 0.65 to 0.86, considerably better than the official Government estimate of 0.7 to 1.1 published last Friday.
They use a more complex and nuanced approach to estimate the current real-world rate of infection rather than looking back roughly two weeks, as Sage does.
The UCL team said their modelling showed that the third national lockdown was the most important factor in explaining the drop in cases from the early January peak.
However, they added that the figures cannot be fully explained without taking into account the growing impact of Covid vaccines, which they believe have an efficacy of at least 56.5 per cent"