There are none. When I came to work on a short visa in 1970- I had to leave when it came to an end. We decided to marry since that was the only way we could be together legally. I then had a terrible car crash, 7.5 months in hospital and then 1 month to learn to walk, first on crutches, then on sticks. We got married in hospital, abroad, and I joined DH a couple of months later- still severely handicapped, needing a further operation, and unable to work due to the above. I did go on to get a Uni Degree as a mature student when our youngest child started school, and worked very hard for State Edu all my life- and OH in his career too. Nowadays, I would not be able to join my husband, as he would not be earning (at the time) a high enough salary to bring his foreign wife! There would be not legal way for us to be together in the UK. NONE.
Especially as he discovered, by chance! just after we married, that he was not actually British!!! He was 2 when his parents moved to UK, and his parents never did the necessary for him to be registered British when SA was kicked out of te Commonwealth due to Apartheid.