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Anyone can have a bad day when sitting exams so some minor slips in a couple of modules shouldn't be decisive in your application, particularly if it's clear that the lower marks are unrepresentative. Consequently, we don’t mind resits under such circumstances, providing the number is small and the predicted increase in performance is significant - so we wouldn't want you to resit a whole raft of modules to achieve only a very marginal improvement, for example.
It is helpful if your UCAS referee can explain why your original module results were unrepresentative. If appropropriate, you may wish to submit an Extenuating Circumstances Form.