Mating swarms are a nuisance and, if they do not return, a loss.
A couple of suggestions:
Keep the nucs in the shade - small hives are more liable to overheat and
abscond. This can be a great problem with mininucs.
Make sure that there is some open brood in them as the bees are less likely
to leave open brood.
Best wishes
Peter
52.144442, -1.503509
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