I've heard a lot of people from the UK refer to Brits of South Asian descent as "Asian". Clearly, they're no longer Asian if they live in the UK but everyone seems to understand the essence of what's being said. The geographic reference is being used as an ethnic reference. When I was there, an English mate if mine who's parents were Indo Guyanese was also called Asian. My point isn't so much the word as the context in which it is being used.