Problems with ID

We were late getting to Badaan this morning and were greeted by a group of eager farm workers who quickly pointed this stange fellow, out to us above one of the locations where we have a permanent ringing site. The workers told us it had arrived the evening before and had a very pleasant call. I only have a few African field guides here and the nearest thing to it I could find is a Violet Turaco - I might be barking up the wrong tree but think it is certainly closely related if that helps. We would love to here from anybody who can identify or confirm the species