There are all sorts of reasons why someone might not be able to claim injury compensation for themself, and diminished mental capacity, whether it was caused by the injury or not, is one of them. That's why the Mental Capacity Act 2005 enables you to make a compensation claim on behalf of a friend or family member who lacks mental capacity as a result of: A brain injury An illness such as Alzheimer's or Dementia A mental illness or learning difficulties If you want to know more about claiming on someone else's behalf under the Mental Capacity Act 2005, talk to one of our claims experts today.