Traditionals can be just as vocal as Modern but do tend to be a little quieter. There is no Applehead in UK, apparently they were invented here, BUT there is a traditional Siamese in UK, who were there long before the show style of today (really thin, huge ears, slanted eyes etc.) and who looked I think, similar to my Willie (without the white feet and chin), but since they are BYB bred I don't really know what to call them for sure. Apparently there is a big difference between old-style traditional Siamese and Applehead, I'm doing research on it right now, it's interesting.
ETA: only one website said there is a difference between applehead and old-style so now I'm just confused lol.