Aye, back in our youth it was a political statement. British Asians were
politically black. It was an all-inclusive term in Britain for people from immigrant communities and heritage facing racism. The move to eject you from that identity was a turning point, when anti racism started to be not about fighting inequality but about fighting
for difference. But the OP asked that we not go there, so I won’t go into that. The issue I’m highlighting is that at one point it was
your preferred term but
others excluded you from it.
The link
cesare posted is a good discussion, though I share
Serge Forward ’s suspicion of “official” papers on the matter.
The general advice though must be: listen, learn and try not to be a dick.