evidence: Lowest-cost groceries have become 17% more expensive in the past year, ONS data finds [...] The price of low-cost everyday grocery items has increased 17% in the 12 months to September, data from the Office of National Statistics (ONS) has shown, more than the average rate of food and drink inflation. [...] Some items increased by more than the 17% yearly rate. Vegetable oil has increased 65% in price, pasta 60% and tea 46%.