The race dynamics in England must be a bit different - but rest assured that if it's Asian gangs that are "over represented" in this grooming thing, the population knows it. The PC effect is that it will be more acceptable for an Asian to be a groomer - it becomes an accepted part of the fabric of what defines Asians in England.
Britain will start referring to Asians in the most polite of ways, certain descriptors for Asians will be off limits, etc. But the Asian grooming will continue, and the actual opinion of Asians won't change. In other words, nothing gets fixed.
Analogous to the US, it's like when the media doesn't report homicides in Baltimore, and promotes the use of 'proper' terminology for the people that live there. You would think that this would give white people the impression that everything is just rosy in 'that kind' of community, and at least a few white people would be looking to buy a house and live there.
This doesn't happen, because everyone knows - even leftists - that PC is a veneer and changes absolutely nothing. There's what's happening at ground level, and then there's the fluffy pink clouds of PC.
I will say this though - PC does have a function for the left. It presents itself as curative, yet doesn't change the white mentality or the minority mentality. This keeps the racial status quo, and allows political posturing (and profit) based on race.