" "Asian" in PC Brit-speak usually means Pakistanis."
I'm not sure that it is 'PC', more a hang over from Colonialism when we actually still owned most of 'Asia'.
We tend to use 'Asian' for anyone who looks like they come from the Indian sub-continent (e.g. Indians, Pakistanis, Bangladeshi's, Sri Lankans). Whereas for the types of people you would call Asians (Chinese, Thais, Japanese etc) we call them a very unPC 'Orientals'.
I thought there was another term you used for them! ;)