I'm happy to say I think Butter is feeling a little better. I've moved them to somewhere warmer and we've just left them to settledown. He is now eating on his own and he seems more perky.
I'm still watching his breathing, it has slowed alot so hopefully it was just all the stress of a new home. He's pooing as well now which seems normal and he's been preening today, so fingers crossed he's gonna be okay but if im worried tomorrow he'll be off to the vets.
Thank you for your advice, it's lovely to have somewhere to come and get help.
P.S I keep calling Butter a he when he maybe a she! I'm not sure yet.
Sky is a boy he's got blue above his beak.