As has been pointed out that’s just one week not for the whole pandemic.
Let’s do some elementary probability.
2.66% is a probability of 0.0266 of catching Covid that week, or 1-0.0266 which is a probability of 0.9734 of not catching Covid that week.
The previous week was 2.36% or 0.9764.
So, the chance of not catching Covid either week was 0.9764*0.9734 which is 0.9504 - or 95%, give or take.
Soooo - for the two weeks in question 5% of the UK population had Covid.
The week before that was 2.14%, mix that in and we have 93% of the population Covid free over the three weeks.
Go back another week and it was 2.31%, mix it in and it’s 90.1% of the population Covid Free, 9.9% having caught it. Note that’s *nearly* the same as 2.66+2.36+2.14+2.31, but not quite. The difference is due to the fact that you can catch Covid more than once - not many over 4 weeks I guess but that will figure more and more as the weeks are folded in.
The next 4 weeks back (w/c 3, 10, 17 and 24 Feb 2023) were 1.42%, 1.56%, 1.88% and 2.18% - mix those in with the March figures and it’s 84.6% of people who were lucky enough to escape Covid over that 2 month period and therefore 15.4% who copped a dose.
Fold in Jan 2023 and we have 74.3% Covid free (over the period Jan-March 2023).
Keep adding in the data and by the time you get back to include Oct 2022-March 2023 you will find that 44% will have had Covid in this period, 56% not - I can’t go back further as the ONS site is blocking me at the moment (too many downloads) but if I were to continue adding the data in I can guarantee I could demonstrate that 85% (or more) of the population is likely to have had Covid.