The 2014 regulations will require registered persons to be open and transparent with service users in relation to their care and treatment. The regulations also require registered persons to notify service users when a safety incident appears to have resulted in harm to the service user.
All the more reason for people to have and use a Power of Attorney for Health and Welfare.
A duty of candour toward the 'service user' -- the person with dementia -- raises interesting questions. And once the dementia has progressed to the point where the 'service user' has no capacity to understand, what's the point anyway?
But if you're the attorney, the service provider logically must have a duty of candour toward you as well. And as attorney, you have the authority to decide what's in the person's best interests, and therefore what they should or shouldn't be told.
The article is interesting but doesn't mention attorneys at all.