I can not quote chapter and verse of the ANO, i am only going by what we have been told by the BMFA and the Poster we was sent by them from the CAA
http://www.caa.co.uk/docs/1995/CAP%201202UAVsafetyrules.pdf.
it clearly states to stay away from airports and airfields.
The BMFA are not a "authoritative source" as you say but the drone pilot would be required by the CAA to have insurance as part of his approval from the Civil Aviation Authority so most likely it will be through the BMFA and would be void if he did not follow there regulations.
Either way if he was to fly in to the flight path of a landing aircraft he would be putting aircraft/persons in danger and that would be covered in the ANO.