shillings (). Extra charges allowed for cabaret shows and luxury hotels. Public catering About 2,000 new wartime establishments called British Restaurants were run by local authorities in schools and church halls. Here, a plain three-course meal cost only 9d () and no ration coupons were required. They evolved from the London County Council's Londoners' Meals Service, which began as an emergency system for feeding people who had had their houses bombed and could no longer live in them. They were open to all and mostly served office and industrial workers. Cooking depots were set up in Sheffield and Plymouth, providing roast dinners, stew and pudding. Hot sweet tea was often distributed after bombing raids. Health effects In December 1939, Elsie Widdowson and Robert McCance of the University of Cambridge tested whether the United Kingdom could survive with only domestic food production if U-boats ended all imports. Using 1938 food production data, they fed themselves and other volunteers one egg, of meat and of fish a week; of milk a day; of margarine; and unlimited amounts of potatoes, vegetables and wholemeal bread. Two weeks of intensive outdoor exercise simulated the strenuous wartime physical work Britons would likely have to perform. The scientists found that the subjects' health and performance remained very good after three months; the only negative results were the increased time needed for meals to consume the necessary calories from bread and potatoes, and what they described as a "remarkable" increase in flatulence from the large amount of starch in the diet. The scientists also noted that their faeces had increased by 250% in volume. The resultskept secret until after the wargave the government confidence that, if necessary, food could be distributed equally to all, including high-value war workers, without causing widespread health problems. Britons' actual wartime diet was never as severe as in the Cambridge study because imports from the United States avoided the U-boats, but rationing improved the health of British people; infant mortality declined and life expectancy rose, excluding deaths caused by hostilities. This was because it ensured that everyone had access to a varied diet with enough vitamins. Blackcurrant syrup and later American bottled orange juice was provided free for children under 2, and those under 5 and expectant mothers got subsidised milk. Consumption of fat and sugar declined while consumption of milk and fibre increased. Standard rationing during the Second World War The standard