In the preamble to the above it states
It is submitted that there must be a clear connection (not necessarily a casual [sic] connection) between the person’s need and mental disorder for the need is to come within the definition.
I am not sure that necessarily means the “original condition” definition is still good law.
Section 117(6) refers to services which a) meet a need arising from or related to “the person’s mental disorder” and b) which have the purpose of reducing the risk of deterioration in “the person’s mental condition” and, accordingly, reducing the risk of admission to hospital again for treatment for mental disorder. It does not say that the disorder must be the same disorder which led to the qualifying detention.
For example, somebody originally detained because of schizophrenia could later develop serious dementia. If, without appropriate accommodation or support, the dementia is likely to deteriorate to the point that the person requires admission for treatment, the s117(6) statutory definition would be satisfied. The need arises from a mental disorder and the service is intended to reduce deterioration and the risk of readmission (f only for different reasons).
It would not be enough that dementia is a condition which can, in general, lead to admission. There would need to be an evidential/causal connection between that person’s dementia, the service required and the risk of deterioration and admission. However, once that connection exists, excluding the service because the dementia was not the “original condition” appears to add words which are not found in s117(6).
Afeworkpredates the statutory definition and derived the “original condition” requirement from the concept of “after-care”. Parliament subsequently chose broader wording referring to the person’s current mental disorder and mental condition, rather than the condition for which they were originally detained.
If I’m correct (which, let’s be honest, is unlikely) that might mean that Afework would be differently decided today provided the injury was debilitating enough that, without support, the person’s mental condition was likely to deteriorate to the point that hospital admission became necessary.