Of course B v Sec of State decided that as long as the claimant was aware of the change of circumstances, it did not matter if his mental state prevented him understanding the need to make disclosure, as long as disclosure of thie particular change had been clearly and unambiguously required of him. So the mental state is only relevant to whether disclosure is required if, as Claire says, there is not even the capacity to realise what has happened.
This is by no means impossible. My mother had bipolar disorder, and was never actually sectioned but was admitted as an emergency several times in her manic phase (once freaking out at her regular outpatients appointment). She never ahd any recollection of these periods afterwards and it is quite likely she had no idea where she was for the first few days at least, before she began to come down.
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