In reply to Dave Garnett:
Ok. I know that informally, Defra aren't really bothered about the reporting of unexplained bird deaths anymore. I'm also aware that during foot and mouth, access restrictions were used as an excuse to limit farmland access long after the threat had diminished.
As I said, where access is sensitive, I would not wish to antagonise land owners, and I don't keep poultry, but I would be interested to know what the objective* risks are now considered to be
* I appreciate that in environmental sciences, "objective" is a difficult word