In which Hertfordshire town are the Tesco headquarters?

Tesco PLC, trading as Tesco, is a British multinational grocery and general merchandise retailer with headquarters in Welwyn Garden City, Hertfordshire, England, United Kingdom. It is the third largest retailer in the world measured by profits and ninth-largest retailer in the world measured by revenues. It has stores in 12 countries across Asia and Europe and is the grocery market leader in the UK (where it has a market share of around 28.4%), Ireland, Hungary and Thailand.

Tesco was founded in 1919 by Jack Cohen as a group of market stalls. The Tesco name first appeared in 1924, after Cohen purchased a shipment of tea from T. E. Stockwell and combined those initials with the first two letters of his surname, and the first Tesco store opened in 1931 in Burnt Oak, Barnet. His business expanded rapidly, and by 1939 he had over 100 Tesco stores across the country.