What can I do?Watch
More about University of Huddersfield
I) You can choose to study another subject. Maybe something that is not in the same field even, but somehow related. That way, you can choose a study subject more fit for your capabilities (and I don't mean something easier, but for example a textual programme rather than numerical or vice versa etc..) and once done, you can do a Master's on the field that you wish to actually work in.
II) It could also be the University that you are currently studying at that may be the problem in the equation. Many times, millions of students who are academically capable ended up failing during their studies. If this is the case for you, try switching universities. If your overall sixth-form grades are lower than average, try applying to Dutch universities. Their entry requirements are very lenient, and the study format is very different to that in the U.K. so you may have a big chance there.
(Try to avoid Maastricht University though)
Best of Luck !