It's partially because of both the numbers being hospitalised and the large number of NHS staff that are isolating at home. It won't take much for the NHS to collapse, especially when we have a combination of staff isolating due to Omicron combined with Javid sacking all the unvaccinated front-line staff - and there are lots of those.
Twitter thread worth reading here: https://twitter.com/ChrisCEOHopson/s...779910149?s=20
I am certain Omicron is driving the rapidly-increasing hospitalisation, and still of the opinion that suggesting Omicron is "less severe" is rather foolhardy. It will kill people and I really wish people would stop saying "but South Africa". Different demographic altogether.