So Boris Johnson is trying to get all the schools open again in September - he wanted to do this earlier but the infection rate was high enough to stop him:

Boris Johnson: Moral duty to get all children back in school - Top stories this morning - BBC

His Education minister has even come out and says that there is little risk of children spreading SARS-Cov-2, and that research showing such will be published later (how convenient):

Little evidence of Covid transmission in schools, says Williamson - Top stories this morning - BBC

We should note that the UK now is more complete in testing than we here in the US.