FWIW I've looked a bit at the data on the rates of footfall. There's only 14 places in the country which have recovered to pre-covid levels now.
www.centreforcities.org/data/high-streets-recovery-tracker/
Blackpool, Bournemouth, Birkenhead, Southend, Chatham, Burnley, Basildon, Doncaster, Portsmouth, Telford, Warrington, Wigan, Sunderland and Hull though there are a few others which are close to 100% footfall rates.
Yet if you look at the list of places where footfall has recovered least Leicester, Bristol, Sheffield, Cardiff, Nottingham, Leeds, Oxford, Birmingham, Manchester and London it doesn't seem to suggest there is much of a link with things reopening. At least not directly.
Especially when you look at both lists and the list of places under local measures and on the areas of concern watch list.
You would expect there to be a correlation between places with the most normal levels of footfall, and very large and sudden increases in covid rates. I'm not sure there is yet evidence for that
But I cavet that by also pointing out that the first list is exclusively provisional towns which have much older demographics than the cities. And the universities are yet to return. Which will affect what is happening and the patterns.
It will be interesting to compare increases in cases and increases/declines in footfall over the next couple of weeks....