The Competition and Marketing Authority reviewed Unit Pricing. You can find their report and an open letter here.
Unit pricing - GOV.UK (www.gov.uk)
The review identified several practices that we think are problematic, and which are likely to prevent consumers from making informed decisions when comparing products. In summary, the practices of concern are:
• examples of missing or incorrectly calculated unit pricing information – in some supermarkets and variety store retailers we saw isolated examples of this; however, in other variety store retailers we reviewed we found missing information across whole product ranges
examples of incorrect units of measurement – we saw examples of some grocery retailers using grams and millilitres as standard when the PMO requires most products to be unit priced by kilogram and by litre;
• different unit metrics being used for the same type of product, such as liquid laundry detergent – both within the same retailer and across different grocery retailers in-store and online – making it hard for shoppers to compare prices on a like-for-like basis;
• issues with unit pricing for products on promotion – we found grocery retailers are taking different approaches to displaying unit prices for products on promotion both in-store and online, with some grocery retailers not displaying unit prices for discounted products at all;
• examples of unit prices in-store, particularly among the variety stores, which we consider are difficult to read;
• certain pages on some grocery retailers’ websites not providing a unit price alongside a selling price until individual items were selected
We expect grocery retailers to:
• ensure that they unit price all their products of the same type using the same metric;
• display the unit price of each product clearly next to the product and selling price instore and online;
• give unit prices for products on promotion for all types of promotions where this is feasible. For example, for price reductions, promotions where a loyalty price is presented alongside a standard selling price, and multi-buy promotions for products of the same price and size across both in-store and online;
• review staff practices, procedures and training so that mistakes in unit price labelling do not occur.