The particular risk right now is coming from the disease being able to spread so widely whilst in a largely-vaccinated population. The fabled "herd immunity" hasn't kicked in, so, whilst most of those who are vaccinated aren't getting (very) sick, what they *are* doing, in increasingly large numbers, is catching it. This increases the chances of a vaccine-resistant variant emerging.
The more prudent course of action would have been to wait to ease restrictions until case numbers could be shown to stay so low that this scenario had much less chance of happening. As it is, it's too late to stop the spread of the disease without drastic measures that there is no political will for -- certainly not whilst Johnson is pressured by his own party to move on from the lockdown cycle.
So, there'll be more deaths, and many more hospital cases, in the coming weeks, and the hope has to be that the risk of a new vaccine-resistant variant emerging is very much less than I've implied above. We'll have to compare notes in six weeks.