You may recall last year Jack Monroe suggested that own brand/cheap label goods were going up in price faster than more expensive goods....
The ONS claimed she was wrong (on limited data) & Monroe was attacked by mansplaining economists....
Now Alberto Cavallo & Oleksiy Kryvtsov (in a NBER paper discussed in the FT) have looked at a much wider set of data & have confirmed/vindicated Monroe's conclusion: cheapflation is running higher than 'normal' inflation; in the UK by around 6%!