PLEASE read the sticky threads at the top. All your questions will be answered there.

As I have said a hundred times it is illegal to live together, although many do. You cannot rent jointly or have anything in joint name sif unmarried. You will have to get your own sponsorship and a visit visa is only valid for 60 days.

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"Good advice is always certain to be ignored, but that's no reason not to give it." Agatha Christie