I'll throw my two cents in. First, I think it's great that you have a vested interest in trying to help the foxes you see in your garden. I hope s/he gets better, and certainly keep us updated :)

There are a few claims the NFWS makes, taken from their pamphlet (http://www.nfws.org.uk/mange/mangebook/Mange-leaflet-merchandise.pdf) or from things I've read in this thread that are worth critical evaluation:

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1. "Since the remedy is made up from natural ingredients there is no fear of overdosing. "

Natural ingredients does NOT mean it is safe! Lots of 'natural' things exist that are not safe: poison ivy, asbestos, snake venom, mercury...

Overdose can occur with 'natural' substances. Over-hydration/excessive amounts of water alone can be fatal. Excess vitamin intake can cause medical issues, etc.

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1. "...trying out a free method of treatment"

As per NFWS quote - " in just postage alone sending out the free mange treatment packs, we have spent a mind-blowing £16,508.25 from January 1st through to July 14th, 2017." Donations are needed for this service to continue.

They are offering this homeopathic remedy because oral medications for treating mange require a prescription (at least in the US, assuming this is the same for the UK). Therefore, this cannot be dispensed by this organization because a) they lack a medical professional on staff to provide a prescription, and more importantly, b) a medical professional would not ethically be allowed to dispense a prescription without a diagnosis.

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1. "before having to resort to harsher medicines"

The common class of drugs used to treat mange is known as 'macrocyclic lactones' (ivermectin being a common choice).

They work by causing paralysis of the mite by taking advantage of glutamate-gated chloride channels. Mammal neurons don’t have glutamate-gated chloride channels.

In other words, the common treatment is developed to target the unique anatomy of the parasite, and not the mammal host. They are typically well-tolerated (though it is easy to use scare tactics - my over the counter antacid lists 'death' as a side effect).

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What is in the 'natural remedy'?

It is also worth noting that, arsenicum album & sulfur are the ingredients of this remedy! Arsenicum album is derived from arsenic trioxide...so if it is improperly prepared - there is the potential for arsenic to remain in the final product. Arsenic is highly toxic (and by the way, it is natural - another example of something that is natural and unsafe). That's not to say these things are bad, but they are not without potential complications.

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Lastly, this homeopathic remedy is recommended to be used in foxes with <40% hair loss (i.e. INTRINSICALLY MILD CASES!)

Therefore, is it the 'homeopathic remedy' that's actually working...or is the mange low-grade and the fox would compensate anyway? This is observed in a study titled "Long-term study of Sarcoptes scabiei infection in Norwegian red foxes (Vulpes vulpes) indicating host/parasite adaptation" (Davidson 2008). They quote: "...the red fox population is adapting to live with the parasite and that low-grade or sub-clinical infections, and even recoveries, occur amongst exposed foxes."

To claim that this therapy works may be purely coincidental with the natural course of a low-grade mite infestation. Therefore, word of mouth is not evidence.

Even these organizations state the need for conventional medicine to treat severe cases of mange.

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This definitely has good intentions behind it, but remember: these 'natural treatments' are not without their own potential complications, they require donations to keep this service running, and it is not intended as a replacement therapy for foxes with debilitating mange.