http://www.caa.co.uk/docs/33/1108.pdf Seems to clarify the role of mandatory observer and 1000ft AGL with LOS. Also I noticed that if you are flying under this FPV Exemption it now does not allow people under your control within 30m of takeoff and landing. It replaces it with a more specific set of persons... "the competent observer, other adjacent model operators, or any model flying club members" Yet the ANO Article 167 states " (3) Subject to paragraph (4), during take-off or landing, a small unmanned surveillance aircraft must not be flown within 30 metres of any person. (4) Paragraphs (2)(d) and (3) do not apply to the person in charge of the small unmanned surveillance aircraft or a person under the control of the person in charge of the aircraft" So, tongue in cheek, you then takeoff under the ANO article 167, then change and fly under the Exemption, then change back to land under 167 again if you want others standing with you under your control. Great work CAA. In reality I think the whole flight is under the Exemption or its not.