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.
More top news
Our political editor Peter MacMahon looks at the significance of today's meeting between May and Sturgeon
Images released of two men following break-in
Theresa May insists that Brexit must come before Indyref2