We do not. We have 1,387 positive cases out of 632,197 tests for Influenza in the 2020-2021 season. Source
It's incredibly low, but not zero. And given all the masks, social distancing, etc. it's not completely shocking. Seasonal Influenza has an R0 of 0.9-1.2 and it spreads in a similar fashion to SARS-CoV-2, whose worst variants have an R0 of 4.3-5.7. So the people staying home, the social distancing, the masks, etc. that are being used to try and control the spread of SARS-CoV-2 are likely having a huge impact on Influenza's ability to spread.
It’s a miracle...
Not a single case of flu detected by Public Health England this year as Covid restrictions suppress virus
https://www.independent.co.uk/news/health/flu-cases-covid-england-phe-latest-b1805124.html