the owners are facing legal action.
Time will tell but my guess, for several reasons, is not. Free-range is the acceptable face of poultry farming and with this:-
https://www.theguardian.com/politics/2007/apr/03/birdflu.foodas a contrasting back-story, it would be a gift to the tabloids on a slow news week - “Poor free-range farmer prosecuted because his flock was given bird flu by wild duck but BM got paid 600 grand of tax-payers money for bringing virus in by the truck-load” or some such rubbish.
And then there is the wiggle-room in the regulations:-
“... Any person in charge of poultry... must take all appropriate
and practicable steps to ensure... poultry are housed
or otherwise kept separate from wild birds. “
Plenty enough for a half-decent barrister methinks - “M'lud, I understand m'client, lacking a place to house his free-range birds erected numerous scare-crows that, unfortunately, blew away in the recent gales...”