According to the Evening Standard, only four postcodes in the UK do not have a Tesco. They are the Outer Hebrides, the Shetlands, Orkney and Harrogate.
(Tesco plc is a United Kingdom-based international supermarket chain. It is the largest British retailer by both global sales and domestic market share, the world's third-largest grocery retailer, and is the fourth-largest retailer behind Wal-Mart of the United States, Carrefour of France, and The Home Depot of the United States. As of 25 February 2006, there were 1,897 outlets in the UK, covering a total of 25.9 million sq ft.)