In 1956 the first Tesco self-service supermarket was opened in a converted cinema in Maldon. By the early 1960s, Tesco had become a familiar name. As well as groceries, the stores sold fresh food, clothing and household goods. Tesco stores were located in the high streets of many towns. The Tesco store which opened in Leicester in 1961 had 16,500 square feet of selling space and went into the Guinness Book of Records as the largest store in Europe.

By buying in bulk and keeping costs down, Tesco should have been able to sell at very competitive prices to its customers. Until 1964, however, suppliers were, by law, able to insist that retailers charged a set price for their products (the system known as Resale Price Maintenance) which meant that it was difficult to reduce prices. The intention was to protect small shops against the lower prices that big retailers could offer their customers.

Tesco introduced trading stamps so that it could bring lower prices to its customers. Customers collected stamps as they purchased their groceries and other items. When they had collected enough stamps to fill a book, they could exchange the book for cash or other gifts. Other retailers soon copied Tesco. Sir Jack was one of the leaders in persuading Parliament to abolish Resale Price Maintenance in 1964. After this, Tesco continued to offer trading stamps until 1977.

 Apart from opening its own new stores, Tesco bought existing chains of stores. In 1960 it took over a chain of 212 stores in the north of England and added another 144 stores in 1964 and 1965. In 1968 the Victor Value chain became part of the company.

Tesco introduced the concept of a superstore in 1967 when it opened a 90,000 square feet store in Westbury, Wiltshire. The superstore was a new concept in retailing - a very large unit on the outskirts of a town, designed to provide ease of access to customers coming by car or public transport. The term superstore was first actually used when Tesco opened its store in Crawley, West Sussex in 1968.

By 1970, Tesco was a household name. Its reputation had been built on providing basic groceries at very competitive prices; the slogan ‘Pile it high and sell it cheap’ was the title of Sir Jack Cohen’s autobiography. But as people were becoming better off, they were starting to look for more expensive luxury items as well as everyday household and food products. In the late 1970s the company decided to broaden its customer base and make its stores more attractive to a wider range of customers. Many of the older, high street stores were closed and the company concentrated on developing bigger out-of-town superstores. The superstores sold a broader range of goods, and had wider aisles and better lighting. While still offering very competitive prices, the emphasis was now on quality, customer service and a customer-friendly environment. In 1974, the company developed filling stations at its major sites, selling petrol at very competitive prices. In line with its new image, Tesco finally stopped giving trading stamps in 1977, at the same time introducing a price cutting campaign under the banner "Checkout at Tesco" which proved to be a major success.

In one year in the late 1970s, the Tesco market share increased from 7% to 12%, and in 1979 its annual turnover reached £1 billion for the first time.

During the 1980s, Tesco continued to build new superstores, opening its 100th in 1985. In 1987 it announced a £500 million programme to build another 29 stores. By 1991, the popularity of Tesco petrol filling stations at its superstores had made the company Britain’s biggest independent petrol retailer.

In 1985 Tesco introduced its Healthy Eating initiative. Its own brand products carried nutritional advice and many were branded with the Healthy Eating symbol. The company was the first major retailer to emphasise the nutritional value of its own brands, to customers.

By 1990, Tesco was a very different company from what it had been 20 years before. The Tesco superstore offered customers a very wide range of goods, a pleasant shopping environment, free car parking and an emphasis on customer service. Although many financial experts had not believed that the company could so radically change its image, the new approach saw sales and profits rise consistently. Existing customers took advantage of greater choice, and new customers discovered that Tesco could successfully match the offer of any of its retail competitors.

In the 1990s, the company built on its success by developing new store concepts and new customer-focused initiatives. In 1992, it opened the first Tesco Metro, a city centre store meeting the needs of workers, high street shoppers and the local community. This was followed by Tesco Express, combining a petrol filling station with a local convenience store to give local communities a selected range of products. The company also expanded into Scotland when it acquired a chain of 57 stores from William Low.

Tesco broke new ground in food retailing by introducing, in 1995, the first customer loyalty card, which offered benefits to regular shoppers whilst helping the company discover more about its customers’ needs. Other customer services followed, including home shopping for those who hadn’t the time to visit a superstore, Tesco Direct for catalogue shoppers and the Tesco Babyclub for new parents. Currently, the company is adding financial services to its provision for customers.