Medlink is still popular because lots of people think that it'll increase their chances of getting into medical school, when the truth of the matter is that doing more work experience/volunteer work/extracurricular activities will benefit your application a lot more. Not everyone can afford to spend £300 or whatever on a course, so no medical school that I've come across will give anyone an advantage simply for attending it. The information they give you can be found out about online anyway for free, or by simply emailing universities, going on open days and looking through prospectuses. The Student Room is as helpful as any Medsim/Medsix/Medlink course will be. Using the time to catch up with work and to make sure you ace your January exams would be more useful as well.