The UK's Chief Inspector of Immigration, John Vine, has been conducting research into abuse of the marriage system by immigrants seeking to obtain residence in the UK.
Mr Vine has warned that sham marriages are 'a massive loophole' which is allowing thousands of people to enter the UK and remain in the country illegally.
Mr Vine said 'Sham marriages between non-Europeans and EU nationals are an increasing threat to immigration control. If not detected, they allow individuals to settle in the UK on the basis of relationships that are not genuine'.