We gave him his meds this morning and he seemed no worse or better, but he has now been referred to Manor Vets (Edgbaston, B'ham), where they will be doing full bloods, x-ray, etc. He will probably be transferred to the Halesowen branch as they have a hospital staffed around the clock.
He didn't eat much yesterday, so that would further weaken him.
Of course, we are closely monitoring the other birds. They all seem fine, showing no symptoms of anything.