UK
In the UK, the directive is transposed into the Immigration (European Economic Area) Regulations 2006 amended by SI 2009/1117 and amended by SI 2011/1247. The implementation is reasonably complete and accurate although non-EEA family members require an entrance clearance (called EEA Family Permit) to enter the UK even if they are in possession of a 5-year residence card of another EEA member state, in breach of the Directive. The UK law recognises same-sex relationships, and it also has a clause for unmarried/unregistered partners. Applications are free of charge.
Read more about this topic: Directive 2004/38/EC On The Right To Move And Reside Freely, Implementation