I had a look at the hive floors in the out-apiary this morning. In the order which I looked at them:
Hive G: lots more comb built. Small numbers of dropped Varroa.
Hive F: lots more comb built. Large numbers of dropped Varroa.
Hive D: lots of activity - evidence suggesting a large number of emerged brood. Large numbers of dropped Varroa.
Hive E: quieter than C and D. Some evidence of brood emerging
Hive C: lots of activity - evidence suggesting a large number of emerged brood. Relatively small numbers of dropped Varroa.