Hi Adam, thanks for the reply.
It's great to be a junior again at 63!
It seems that A was laying really well very early in the Spring and the colony was building well. Then I was unable to check for a few weeks (working long hours and weekends were wet or cold) and next check I found no eggs or brood and later laying workers. There was no evidence of an attempt to raise a queen. I did manage to requeen - I moved the colony across the garden and allowed the flyers back into a new hive. The introduced queen was accepted but after a couple of weeks ceased laying. The flyers dwindled and the hive then robbed out.
Queen B disappeared - I can only assume seen off by an unnoticed virgin. The colony is now building well but I've not found the queen - they are "runners" on the comb and difficult to inspect. Having closed down to a two bee space entrance the robbers have given up and peace is restored. So all is not lost.
I have a bait hive out and a nuc on order as I'm determined to get to three colonies into the Winter - then I'll have more strength in depth next Spring. Or at least that's the theory!
Thanks again for your reply. I have experienced a very different set of circumstances since moving into the countryside, including now a lack of forage in a green desert!
All the best,
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