I charged the mini nucs with bees yesterday and have put them in a cool dark place to chill, draw foundation and settle down before I put the virgins in. All the virgins were still present and correct in their rollers/cages, which was good news.
Suddenly the air was full of bees. They were all rushing into the entrance of the hive that I took all the virgins out of on Saturday. I had thought that there was probably an emerged virgin in there, so I hadn't left them any cells. It was orginally the queenless half of an artificial swarm, so not a huge colony anyway.
These were different bees going in. A different colour. At first I thought it was a mass robbing frenzy, so I popped in an entrance block to even up the odds a bit, so...