Per AI and sourced to the UK government...
“The UK Forced Marriage Unit (FMU) was created in 2005”
But the impetus dates back to at least 2000...
https://publications.parliament.uk/pa/cm200708/cmselect/cmhaff/263/263we106.htm
Per the above...
“The FCO Community Liaison Unit (CLU) was established in October 2000 to co-ordinate forced marriage casework and policy. This was an outcome of the “Choice by Right” report of the working group on Forced marriage.
The joint Home Office—Foreign and Commonwealth Office Forced Marriage Unit replaced the CLU in 2005, in order to allow a joint domestic and international response to the issue.”