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OK. Anorexiria in itself doesn't often lead to sectioning. To be honest, at 5st 5ib it probably wouldn't happen but that doesn't mean this wouldn't be a possibility later.
However, if you want a person to be sectioned then you need to make a referral to the mental health team with the local social services. You can get their details from social services.
All you can do is get a person assessed. Thereafter to section a person two doctors and a social worker must agree.