It could be that you have been ill or suffered an injury that has resulted in your loss of mental capacity. Imagine not being able to make decisions about your own medical or social care.
If this situation should ever arise who would make those important decisions for you, and more importantly do they have the legal rights to do so?
You can avoid any difficult situations by taking out a Lasting Power of Attorney to cover your Health and Welfare needs right now. By doing so you can select who should act on your behalf and to what extent that they can make choices for your care.