Waitrose has asserted it offers "great value for money" - despite selling empty jam jars for 29p more than the cost of a full one. Shopper John Kilbride, from Glasgow, noticed that a branch of the supermarket was selling luxury Bonne Maman conserve for £1.71, while at the same time offering empty jars for £2. In a Twitter post, which has been liked more than 5,000 times, he wrote: "At Waitrose you can buy an empty jam jar for £2 or an identical one full of jam for £1.71. You decide..." The post prompted ridicule on social media as some consumers said the empty jar should be re-labelled as "Waitrose Bottled Fresh Air". However, some shoppers defended the grocer and pointed out that the Bonne Maman was on offer and the empty jar was bigger.