Hennie, do those two spikes come from different vertical levels of the one pseudobulb? It kind of looks like that from the picture but it's hard to be sure. If so, I think that rules out Bulbophyllum because as far as I know they always bloom from an eye at the base of a pseudobulb.
Maybe an Eria species? It resembles some of the ones I've seen in pictures but I don't really know enough about them to have an idea of which one. Anyone else?