For some strange reason,in current UK usage, "Asian" seems to be limited to referring to people with origins in the Indian Sub-continent - India, Pakistan, Bangla Desh and Ceylon. "Oriental" as an adective would mean Chinese and Japanese. People from other parts of Asia would be unlikely to be described as "Asian" - Turks or Arabs, for example.

There doesn't seem to be any logic to these things. For example "Orientals" sounds offensive somehow in a way that "Asians" does not.