Went and had a look at that hive this morning. NO, I did NOT undo it!!!! I managed to get on my knees and look in through the reduced entrance. There is a pile of dead bees on the floor, doesn't look like many though. The other hive has a few dead ones on the mesh floor. As I was kneeling there a worker came out, flew about 2 inches, turned round and went back in. A few seconds later a larger "worker" came tottering out, fell onto the ground and was walking away, I noticed its wings were all chewed up. NOT deformed like in the images of that virus they get, just looking very beaten up. I gave the side of the brood box a sharp rap and there was a goodly amount of buzzing that went quiet quite quickly. Question, do I remove the mouse guard and use a stick to scrape these dead bees out?