I would advise doing more research to make sure those that accept FM also meet your other selection criteria - eg traditional teaching vs PBL, UKCAT vs BMAT, campus vs town etc - before you unnecessasarily narrow your options. Particularly bear in mind that 60% of applicants get no offers, and many of those reapply - as it is often not possible to reapply to the same unis, that means some people will need to find 8 med schools that would look at them.(Original post by bobbyy1234)
I've checked with websites and emailed several universities about further maths and there is plenty of unis that accept further maths and i'll only apply to them.
Generally I would say select subjects that give you the widest range of options possible. Also, it may be a long shot, but it's possible that something goes wrong with one of your other 3 subjects, and you may need to take your 4th AS to A2, which with FM would make a medicine application quite difficult. (This happened with my sister - messed up maths AS and finished up doing A2 spanish instead of maths - not a problem with her degree choice though)
Or does it play no part?