Mystery shoppers help us reveal the supermarkets that deliver the freshest groceries

We sent mystery shoppers from across the country to help us find out what’s really going on with online grocery deliveries. This is what we found out.In this episode of Which? Shorts, our senior retail researcher Hannah Walsh reveals the results of our investigation into some of the UK’s biggest supermarkets, and how their online delivery services compare.We found examples of fresh food being delivered on the same day as its use-by date. We explain how paying more doesn’t necessarily mean your groceries will be fresher or last longer.This episode is read by James Rowe and is based on an article written by Hannah Walsh, originally published in the September 2026 issue of Which? magazine. Read more from our travel experts on our website & sign up for our free monthly Travel newsletter If you're not already a member, join Which? to instantly listen to member exclusive podcasts and gain access to all of our product reviews - all for 50% off your first year's membership