In order to make a successful claim for compensation, you will need to identify who was at fault. It may be that the third party was wholly or only partly to blame for the accident. Even if they are only partly to blame, you may still have a valid claim. You will need to demonstrate that someone else's actions or negligence caused your injuries. Here are some points to consider: What were the circumstances of the accident? Who was to blame? Is there a police report, for example with a road traffic accident? Is there a medical/hospital report?