UK officially sequenced omicron cases are way behind the actual figure, which was estimated at around 70-80% of all new cases last time I looked. Anecdotally it seems London especially is swamped with it at the moment, everyone I know there either has it or knows several people with it. Hospitalisations in London are rising quite fast but it's believed a lot of these are hospitalised 'with' covid not 'for' covid, as patients on ventilation haven't increased at all. Delta cases supposedly falling quite quickly now, but I imagine most deaths currently are delta.