Yes.
It’s very useful to review your planning say once a year to make sure it still reflects your current wishes and choices. This also helps your partner, friends and family as well as health and social care practitioners know that they know your most up to date wishes and decisions.
To change it you can start afresh and complete new forms, or you can make changes to your existing document, making sure you sign and date it again to confirm the changes.
Just make sure, when you update it, that you also provide updated copies to those you gave a copy to originally.