This is the thing, everyone goes on about how it is bad to re-sit and that it literally can prevent you from being considered by top unis...but this is just not the case. I know quite a few people who have resit after the 2 year course and have been accepted into Oxford, LSE and Durham. I think it really depends how you approach the matter. I know that UCL for example, verbally suggests that resits would not be considered and therefore don't apply for Medicine- this is just one way of filtering out those who aren't that keen to study Medicine at their university.