THE quantity of newsprint that London consumes in a single day, Indian dailies would take 10 days to eat up. But the formidable array of grammar and ads hitting London newsstands has very little on and for the subcontinental Asian. And it's not for the lack of a potential market. In London, for instance, the non-white population is over 20 per cent and slated to hit 25 per cent by the turn of the century. But, as Chris Myant, senior information officer at the Commission for Racial Equality in London, says: "Unless you have a staff composition that reflects in some measure what exists on the streets such anomalies are going to be difficult to root out."