Combusters were still being used on the Victors right until their scrapping. The K2 only had them on engines 3 and 4, whereas the B2s had them on all four. We regularly practiced combust starts and used them in anger occaisionally. The main benefit was if you didn't have ground power. You could start an engine combusting and crossbleed the rest. I did that in anger at Palermo in such a situation. A very impressive jet of flame and smoke shot out from below the engine and got the attention of ATC who dispatched the fire crews. The crew chief only just managed to stop them filling the engines with foam!