Buja–Ngombe languages
The Buja–Ngombe languages are a group of Bantu languages reported to be a valid clade by Nurse & Philippson. They are Buja, the Ngombe languages, and Tembo :
Guthrie also lists two unclassified C.30 varieties, Doko and Londo. Ethnologue lists the first as a dialect of Ngombe, and says that the latter is most similar to Tembo, so both may belong here. Glottolog lists Bwela as closest to Tembo as well.