The former No 2 fell 3 3/4p to 264 3/4p as the City cast fresh doubt over its ability to beef up falling sales and re-establish itself. The latest survey by supermarket watcher Taylor Nelson Sofres tracked the spending habits of 15,000 households. It showed market leader Tesco, 3 3/4p off at 264 3/4p, clinging to a 27% market share. Asda, owned by US retail giant Wal-Mart, grabbed 17%.