It is a nice story, and I sincerely hope that it ends happily for the family. I just Googled York Station, and it seems to be quite a ways from the Ouse River, the nearest water that I can see.
The local wildlife people are onto this and will be making sure the chicks and mum get safely to the River Ouse. If the lockdown is lifted before chicks are hatched I'm not sure what they'll do.