You can make a Power of Attorney if you are going abroad for a while and need someone at home to take care of legal or financial issues for you. This type of Power of Attorney does not continue if you lose mental capacity and does not need to be registered with the Public Guardian's Office.
A Continuing Power of Attorney deals with property or financial matters.
A Welfare Power of Attorney deals with more practical matter such as medical treatment, care and accommodation.
These can be combined into one document.
These types Power of Attorney will continue to have effect if you lose mental capacity and should be registered with the Public Guardian's Office.