It's an FTT decision, and it simply confirms what the law says, so maybe not news. http://financeandtax.decisions.tribunals.gov.uk//Aspx/view.aspx?id=10678.
Judge Richard Thomas said that a director doesn't have to register for self-assessment simply because he is a director. See para 43 onwards. At 49: "it will be apparent that I consider that the material on the GOV.UK website is wrong and should be removed. No one should be expected to make themselves aware of what is not a correct statement of the law."