He doesnt actually speak about the proportion of cases.
As I mentioned earlier, there is data on this. Its imperfect and lags a bit behind other hospital data, and only comes out once a week. And its for number of patients in hospital, rather than daily admissions.
Here for example is that data for London, which currently only goes up to December 21st. Both 'for' and 'with' have risen in similar style up to that moment. As a result, so far there is only a modest increase in proportions of 'with', but this may become more significant over time, so I will comment on this again next time that data comes out.
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There are a few other things we can make use of. Given more time for data to come in, the number of patients on mechanical ventilators will start to provide quite some guide as to severity.
And then there is the aspect NHS management etc are not keen to give quotes to the press about - hospital infections. Omicron is expected to cause a lot of hospital infections, and this is already showing up in the very basic data I can ascertain, and via anecdotes such as those from IC3D above. This is always going to have logistical implications that people will need to find solutions for if they want to be able to live without covid restrictions. Whether it also has morbidity and mortality implications to the same sort of extent as we saw in the first two waves remains to be seen, in theory this variant and vaccines should make a notable difference, but this also depends what sort of wards outbreaks happen on and the sheer number of cases.
Data comes from
Statistics » COVID-19 Hospital Activity