Leading UK retailer Tesco will spend £100m (US$142.8m) overhauling around 100 of its superstores, say analysts. Competing supermarket chains Sainsbury's and Safeway recently announced large-scale investment in store upgrades, and Tesco needs to keep one step ahead. Tesco refused to confirm the figure but said: "We have opened a great number of stores in the last few years, but some of our old stores are needing to be refreshed. We are looking at what customers want and incorporating that in store".