Well I got home from work today and he is struggling to stand and after a few attempts to get some peas from the ground, he just gave up and lay on the floor. Fortunately I have an appointment with the vet this evening. It's so sad, not least because the girls are all chirping to each other as the potter around the garden, it's like the haven't even noticed he isn't with them. He was lay down in the yard when I went to pick him up and he didn't even try to stand, just gave a few quiet man-quacks of objection as I scooped him up and put him back in his house. I used to think he was just odd but he is so helpless for such a big boy. Fingers crossed he can be helped......