Even though British system is pretty much same as their once colonized countries, its the hardest place to get residency. Like ECFMG in USA they have something called NHS and their rules are really strict. They only like to have UK graduates. I don't exactly why but i guess b/c they are strong and well committed wellfare state. NHS was actullay trying to pass a legislation which would prevent immigrant doctors from taking employment in UK but there was a big protest. foreign doctors over there always face struggle. They also regulate the amount of doctors they produce so that adds more trouble 4 foreigners. I don't how they deal with bristish nationals who hold a degree from an institute outside of UK.