I still say, in the biosecurity PDF, if it is not practicable to keep geese in (and other species normally out), they can be out but all reasonable steps taken to prevent wild birds congregating round feed areas. I feed mine under cover in the evening, water is in deep buckets. I would add we are up in the Pennines, i would be more worried down the east side, I have signed up for alerts. Not many migrant species up here.
The hens are under cover.