Deceiving stats though. 40m people have been double vaccinated, about 10m people are aged 0-14 (under 12s cannot be vaccinated) in this country, and the majority are unlikely to have been vaccinated. The UK population total is about 65m. Officially 75% of adults have been double-vaccinated, and hospital admissions are overwhelmingly adults:
https://www.ons.gov.uk/peoplepopula...insights/hospitals#hospital-admissions-by-age That 55% of unvaccinated people in hospital are maybe 25% of the population, and that is a top-end figure.
More kids are getting infected, and hospital admissions in comparison to January numbers are high because they are far less likely to be vaccinated. Older people are still dying more frequently than them, it would most likely still be the case for vaccinated >80 against unvaccinated <14, for obvious health reasons.
Does seem like the Delta variant is more transmissible than any of the earlier variants, but I think that has been considered at an early stage.