I did a bit of research on the net, .. pied kingfishers raise their young, not only in pairs but up to 3 or 4 bird, .. a father, a mother, and one or two others which could be the young from the previous year or totally un-related. but they build their hole together as a pair, therefore, i think the female which we saw flying around, may not necessiarly be the mother, or if she is the mother-to-be, then the male maybe trying to entice her back to the hole with the gift.
i will wait for my friend's report from tomorrow before reporting back ..