Sainsbury's started to replace its High Street shops with self-service supermarkets above , which were either in out of town locations or in regenerated town centres. Sainsbury's policy was to invest in uniform, well designed shops with a strong emphasis on quality; its slogan was "good food costs less at Sainsbury's". During the 1970s, the average size of Sainsbury's shops rose from to around ; the first edge of town shop, with of selling space, was opened at Coldhams Lane in Cambridge in 1974. The last counter service branch closed in Peckham in 1982. To participate in the hypermarket sector, Sainsbury's formed a joint venture, known as SavaCentre, with British Home Stores. The first SavaCentre shop was opened in Washington, Tyne and Wear, in 1977; nearly half the space, amounting to some , was devoted to textiles, electrical goods and hardware. As the hypermarket format became more mainstream, with rivals such as Asda and Tesco launching ever larger shops, it was decided that a separate brand was no longer needed, and the shops were converted to the regular Sainsbury's supershop format in September 1999.