I just thought I'd do a quick report. As of yesterday my ducks are now free range and the lawn is getting covered in little piles of duck poop. My DH keeps forgetting to close the gate so I'm hoping they don't disappear, but I keep checking so hopefully all will be well. They're a little dim, but have finally worked out how to get back to their pond last night. There is a wild mallard who's been flying in, for the first time she got to socialise properly with them last night, they had a wonderful time, but did get a little confused when she flew out.
I think I might have to reduce their feed though as they're not eating as much of the grain now that they've access to the yard. They're quite big too, the girl (Sam) is 1.5 times the size of the mallard and the boy (now named Jay) is twice her size!