According to the Home Office a "sham" marriage or "sham" civil partnership typically occurs when a non-European national marries someone from the European Economic Area as a means of attempting to gain long-term residency and the right to work and claim benefits in the UK.
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The arrests come weeks after a much-publicised series of appeals to mark the 30th anniversary of the 18-year-old's death.
Kerrie brings you Sunday's pollen count
Kerrie brings you Sunday night's forecast