Hey guys,
Thanks.
They currently have a tub (the kind of under bed storage ones) to get into but it is quiet shallow and only one can fit in at a time. They also have a builders bucket of water so they can get their whole heads in. They have those 24/7 refilled once or twice a day (depending on how mucky they are being).
It's probably the mating. They have been doing it on dry land, generally when I go over (I think my gander has an odd fetish!). We've had a couple fertilised eggs.
I swear I spend more time worrying that I'm doing alright by these geese than I go enjoying their eggs!
Dans