There are a lot of unconditional offers these days, which means that the university will not look at actual A levels' results at all.

Edit:

"38% of applicants (97,045 applicants) received at least one offer with an unconditional component in 2019, increasing from 34% (87,540 applicants) in 2018, and continuing the year-on-year growth in offers with an unconditional component since 2013." [1]

This year at least one Oxford College has already decided to honour all offers without looking at actual A-Level results , whereby effectively turning all offers into unconditional offers [1]. Granted, this is not a normal year.

Let's be honest, though, if you got an offer from Oxbridge you're very good so they're not exactly taking a risk and it gets them brownie points.

[1] (PDF) https://www.ucas.com/file/250931/download?token=R8Nn7uoI#:~:....

[2] https://www.theguardian.com/education/2020/aug/15/a-levels-r...