I don't normally post in this section 'cos I've got dogs, but just noticed the poorly budgie title, and as I kept budgies for many years thought I'd take a peek.
I noticed the recommendation for Battleflatts vets, for anyone living close by, they are an outstanding veterinary surgery and helped me tremendously (albeit with my dogs).
It's so important to find a vet that knows about your pet, rather than just having general knowledge. I did actually lose a budgie to a vet (different one) that gave the wrong injection in a course of treatment, completely botched the injection and wasn't even comfortable holding a bird, even though she was supposed to be their avian specialist. I never did get any response from her about it, she just moved jobs.
Hope your remaining budgie is fit and well again soon, if you're at all worried, it is worth checking Battleflatts out
