Seen in Entebbe today.
The eye ring isn't so yellow, the mandible appears pink below and darker-blacker above, there are no white spots on the flanks, the vent is dark entending on to the belly. It doesn't look a great fit for red-billed which I know well.
However, there are apparently two white spots on the forehead (?) and can the vent be other than solid black for black-bellied. I only know black-bellied from books.
All help gratefully received as ever.