‘(1) For the purposes of this Act, a person lacks capacity in relation to a matter if at the material time he is unable to make a decision for himself in relation to the matter because of an impairment of, or disturbance in the functioning of, the mind or brain. (2) It does not matter whether the impairment or disturbance is permanent or temporary. … (4) In proceedings under this Act or any other enactment, any question whether a person lacks capacity within the meaning of this Act must be decided on the balance of probabilities…’
‘(1) For the purposes of section 2 a person is unable to make a decision for himself if he is unable – (a) to understand the information relevant to the decision, (b) to retain the information, (c) to use or weigh that information as part of the process of making the decision, or (d) to communicate his decision (whether by talking, using sign language or any other means). (2) A person is not to be regarded as unable to understand the information relevant to a decision if he is able to understand an explanation of it given to him in a way that is appropriate to his circumstances (using simple sign language, visual aids or any other means). (3) The fact that a person is able to retain the information relevant to a decision for a short period only does not prevent him from being regarded as able to make the decision. (4) The information relevant to a decision includes information about the reasonably foreseeable consequences of – (a) deciding one way or another, or (b) failing to make the decision.’
‘(2) A person must be assumed to have capacity unless it is established that he lacks capacity. (3) A person is not to be treated as unable to make a decision unless all practicable steps to help him to do so have been taken without success. (4) A person is not to be treated as unable to make a decision merely because he makes an unwise decision.’
‘A power of the court under these Rules to make an order includes a power to vary or revoke the order’