Argh! My email didn't tell me I had received replies, so I've only just seen many of these suggestions. Do you think it's too late now to try your suggestions?
The little duck is still going strong. It's neck hasn't got worse, but nor has he got better. He eats plenty and is generally happy as Larry. He swims well, but it tends to be in one direction because of his neck.
As I said in my last post, he has grown very slowly and still hasn't got many adult feathers. But he is growing and getting bigger, just slowly.
I shall try and attach a photo for you so you can see him