Re: MBBS from Lahore - - -> Work in UK
^It's not that. How would your brother be coming over? I work visa I guess? That's the problem, they just aren't handing out work visas to foreign doctors, especially not for the training years. In general the way they work are brisith jobs for british doctors first, then EU doctors and then lastly foreign graduates. Even if you are a british citizen but qualified abroad, you will have a problem.
However, that's not to say they can't get jobs, just not through the work visa route. If you come to the UK as a spouse there is nothing stopping you taking the PLAB exams and applying for posts. Quite a few people I know have done this in recent years and it takes them a while 1-2 years but they get a post eventually. Even spouses of engineers on work visas have managed it - one last year and a second is taking her PLAB at the moment.
I don't see the route in which you will bring him to the UK?