Over the past years the UK had colonised half the planet with many former British colonies. The Brits have gone to war during both Word Wars in 20th century and Britain has flourished in the past due to people emigrating the UK and now the Tories and the UKIP Party complain about immigration because the Tories like the UKIP believe that migration is ruining the UK when in fact it has been proved that immigration boosts the country's economy. So if the UK leaves the EU, the Brits will loose the rights to travel freely and work in the EU and their other human rights since the UK are now part of the EU.