In 1985, the Enduring Powers of Attorney Act made it possible to appoint a person of your own choosing to administer your affairs in the event of mental incapacity. The Mental Capacity Act replaced Enduring Powers of Attorney (EPA) with a Lasting Power of Attorney (LPA) - which came into effect in 2007.
If you have made a valid (EPA), you can still use this. If not, you my wish to consider making the new LPA for Health and Welfare and Property and Financial Affairs. You will be able to appoint one or more persons to assist you in handling your affairs at the time you most need it.