This seems to coincide with inflation of food prices in the US where there was no Brexit.
That range is significantly lower than 16.2%.
where does this rumour keep coming from?
bar during covid I haven't observed this in any supermarket (unless you go at 9pm on a Saturday night or something, where they haven't restocked yet)
Prices are rising for some lines though.
The idea that this is a "global problem" is convenient for the UK government and Brexit supporters, but not based in reality.
I don't know about reality, but what you've done is delivered anecdotes when we know that prices in the US have gone up about 10% and prices in the UK have gone up 15%. There's no need for anecdotes, especially for another round of calling Brexiteers deluded.
Eggs got expensive here but it’s generally been in stock.