In general the food offered is Indian food cooked to British taste; however, there is increasing demand for authentic Indian food. As of 2015 curry houses accounted for a fifth of the restaurant business in the U.K. but, being historically a low wage sector, they were plagued by a shortage of labour. Established Indian immigrants from South Asia were moving on to other occupations; there were difficulties in training Europeans to cook curry; and immigration restrictions, which require payment of a high wage to skilled immigrants, had crimped the supply of new cooks.