So the bees are doing exactly what they should be doing in May if the colony is healthy; trying to swarm. Above you can see the beginnings of a 'queen cell' but its empty at this stage.
In one hive the queen excluder does not fit well and there must be too big a gap as not only had they raised up some comb but had even developed and capped several queen cells running parallel to the excluder mesh.
We have been managing our hives to try and avoid an uncontrolled swarm and have split our most vigorous colony. However, it would be very good to pick up a swarm from elsewhere as we are still one hive down from the winter and some new DNA might bring some useful options.
Happy swarming catching!