Back when covid began there was a lot of discussion about the proportion of asymptomatic v pre symptomatic cases. Obviously there is an age differential on this with younger people being likely to have fewer symptoms. Younger people are also more likely to be in less secure employment/ on low wages and therefore to refuse to test when infectious. Anyone who has contact with university students will know that there was some "I'm not being the one that makes my flatmates self isolate" and alternatively "why bother testing, we're all isolating because one tested positive anyway".
ONS estimates try to take account of this by getting people to test who might not otherwise have done so - but again they can only work with the co-operative. Inevitably their estimates will understate the true figures.
Yes cases are rising in the unvaccinated and that was always expected. If you want to avoid children needing to be vaccinated then we need adults to step up and be vaccinated. Fortunately the young who havent had covid are often willing to queue for hours for the pop up vaccine clinics.
There will be problems in places that have not managed to reach enough adults, in other locations cases may rise for a time but without overwhelming the NHS. The more adults come forward the faster transmission in children reduces.
This thread has always analysed data, it is no longer looking at all the data, hence excessive gloom.