evidence: Migration in the UK- Statistics and Facts After World War Two, the British government encouraged immigration from the British Empire's colonies to the UK mainland to meet postwar labor demands. One of the most important groups, who migrated to the UK from the Caribbean between 1947 and 1971, became known as the 'Windrush Generation,' named after one of the first ships arriving in the UK. In more recent years, immigration from the European Union, particularly after the EU's 2004 enlargement, further added to the levels of immigration to the UK. The percentage of British people who saw immigration as an important issue facing the country also rose during this period, with a peak of 42 percent recorded in 2015.High levels of anxiety about immigration in 2015 were undoubtedly influenced by the European Migrant Crisis, which was at its height in that year. These concerns would also play an influential role in the Brexit referendum the following year, which saw the UK crash out of the European Union, with freedom of movement being one of the main casualties.