You may find the following useful

Government Website

This is the main place where you can get information that will help you think about Lasting Power of Attorney, Mental Capacity Act, Data Protection, What to do when somebody dies, Death Grants, Probate and much else besides. This is the generic site where you can search for your specific query.

Further Information

The Omega course aims to enable people to think about their future and end of life plans before they are ill. decisions should be less confusing and frightening when medical staff need to introduce such discussions.
Once someone is,ill the following organisations can be helpful.

Actuarial Calculator:

Enter your details and get a statistical estimate of your likely lifespan.

BEWARE! Put your weight in as pounds not kilos

This does not mean that you will each this age, or that you will retain strength and faculties.