New research suggesting that BSE is now a greater risk in sheep than cattle has led British scientists at London's Imperial College to call for immediate action to protect consumers and screen the 40 million strong national flock for the disease. After the well-publicised fiasco at the end of last year, which revealed that scientists searching for BSE in sheep had actually spent an embarrassing four years looking at bovine brains, still only 180 sheep in the country have been tested for BSE - leaving a true picture of the potential spread of BSE among sheep unclear.