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@Maurice Barnett, the simple difference is that Government Departments are held to account for their mistakes whereas unqualified lay members who attempt to assist are not.
If a Government representative (legally qualified or not) makes an error it is likely that the Government department will pay the costs. How would you recoup from a McKenzie friend? Quite honestly this comes down to unrepresented unqualified people giving advice without insurance. The above article shows how dangerous this can be with no consequence for the McKenzie friend.