 By the mid to late 1960s, there was concern from some people that the new immigrant population were arriving in excessively large numbers and were not integrating into British society sufficiently well.This concern is most widely recognised in former British MP Enoch Powell's famous Rivers of Blood speech made in 1968, in which he warns of the dangers of mass immigration.Powell's subsequent surge in popularity is often seen as a contributing factor in the Conservative party's surprise victory in the 1970 general election.