Tesco's finances might not be holding up too well as of late, but from technological standpoint, the company is certainly ticking all the right boxes. After it debuted the impressive Hudl2 tablet last month, the supermarket giant is now switching its focus to better connecting its customers. Today, Tesco switched live free superfast BT WiFi inside 806 of its stores, replacing the old service powered by O2 and ramping up speeds to 76Mb in available areas. By upgrading its connectivity, the company hopes you'll download more Clubcard vouchers, obtain product information and look up recipes while doing your weekly shop. More importantly, it could also provide a welcome backup for when you encounter those dreaded mobile signal blackspots in some of its branches.