He still has a slight head tilt but is much happier and at home is running around. Today he even climbed up the ladder in the outdoor hutch. He hasn't even tried that since I first noticed that he was sick. So that was a huge achievement.
Unfortunately, B (our girl bunny) was falling over this morning. So she went to the vet as well. She has the same illness as he does. As yet she doesn't have the head tilt so we have caught it early. Hopefully with the antibiotics she will recover more quickly than A did. Plus she loves her food so she may not stop eating as he did.
So here's to twice daily antibiotics for both bunnies for 4 weeks getting them both over this.
The bunnies before they got sick