I finally found a
source for recent influenza case numbers in the UK.
One highlight is number of ICU/HDU admissions for influenza in 2020/2021 compared to previous years. These number are for England.
2020/21: 131
2019/20: 1671
2018/19: 3017
2007/18: 3245
There wasn't an influenza season last winter in the UK.