It is always the same hive that swarms (this was the first warm, sunny day for weeks) so there is definitely a rogue gene pool in this colony. It means we should really think about buying in a new queen.
We only had one suit here so Peter had to sweep them up himself. He put them into a small temporary hive (a lure) with a frame of brood from the old hive. Now we have to decide whether to merge the temporary hive back in with the old hive or not. Swarming really disrupts the honey production cycle. With the bad weather we are looking a meager harvests this year.