Our expert says:
Aha ! As I suspected. There are no "correct" authorities. A Social Worker could advise, possibly help. If any of them have seen a GP recently, he/she could help explore obtaining a compulsory order for evaluation, possibly even for treatment. There is a procedure as to who has the legal authority to request intervention, and though not high on the list, your colleague may well have the right to start an intervention.
It sounds like one of the relatively rare situations when you get a sort of shared delusion, what some would call a folie a trois or a quatre, when a close group of people share the same weird view of the world, and support each other's odd ideas, apparently confirming them.
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