Ok but here’s an article from May where they’re basically warning of the same thing. Maybe not July but they speculate that cases will rise in October-January and that may lead to restrictions.

Variants of concern If a variant of concern emerges with similar transmissibility to B.1.1.7 and with a moderate ability to evade immunity from vaccines and prior infection, the researchers predict that a third wave substantially larger (both in hospitalisation and deaths) than the winter of 2021 could occur.

The team say that remaining at step 3 beyond 17 May is projected to maintain the effective reproduction number around 1 and keep hospitalisations and deaths at very low levels. It would also dampen a third wave if a variant of concern did emerge that could partially evade vaccines and immunity from previous infection. Reinitiating restrictions similar to step 3 could be an option to counter the emergence of variants of concern, at least temporarily until booster vaccines are distributed.

Professor Neil Ferguson, from the School of Public Health, said: "Current trends in the UK are looking very positive, and support the decision to substantially relax restrictions. Vaccines have had a major impact in reducing hospitalisations and deaths, and crucially we know now that they are significantly reducing transmission as well. New variants of concern may pose a risk to reopening which is why a vaccine booster programme in the autumn will be important to help suppress any future outbreaks and maintain population protection."

https://www.imperial.ac.uk/news/220894/latest-models-suggest-smaller-third-wave/