Do you know which supermarket is the cheapest in the UK?Aldi has once again been named the cheapest UK supermarket for a standard basket of groceries. However, according to the latest survey by consumer group Which?, Lidl briefly overtook Aldi last month, claiming the top spot as the UK’s cheapest supermarket for the first time since 2023. However, the lead didn’t last long. Aldi quickly reclaimed its position as the cheapest supermarket, pushing Lidl back into second place.