Well, after feeling very pleased with myself, I nearly managed to kill them. I popped two in the brooder and they seemed fine, wandering out to explore, then rushing back under the brooder plate for warmth. However, late afternoon I get a call from my wife to say they are both collapsed outside the brooder, clearly chilled. Thankfully, we got them back in the incubator and they have fully recovered, but it was a fast lesson. I’m keeping them in the incubator for now, with some food and water that they are all taking well.