evidence: Highly experimental research, based on web-scraped supermarket data for 30 everyday grocery items, shows that the lowest-priced items have increased in cost by around 17% over the 12 months to September 2022: an increase from 7% over the 12 months to April 2022. [...] Vegetable oil showed the largest percentage increase and average price increase between April 2022 and September 2022, increasing 46% (80 pence per litre) during the period; in contrast, orange juice showed the largest decrease, decreasing 8% (6 pence per litre). [...] While there is a lot of variation at the individual item level, overall the lowest prices of the 30 everyday items, weighted by retailer and item, rose by 17% in the year to September 2022. This includes a 9% increase since our previous analysis in April 2022.