I've managed to check the hives today, despite mad preparations for Namissa's Eid party tomorrow. The good news is that Hive 1 has patches of brood on two frames. The bad is that it has almost no stores. I'll be feeding all winter at this rate, but at least it has a chance.
Hives 2 and 4 are also light, but at least they have some stores, and I'll keep feeding. They're strong enough to take the feed down at a decent rate, unlike hive 1. 3 is the only exception; it's pretty much full of stores. They've obviously been going like mad during the better weather.
Apart from the lack of stores they're all looking pretty healthy.