Britain has long welcomed corrupt money from abroad—but thanks to David Cameron, that’s about to change

The charge aimed at Britain is serious: we welcome corrupt foreign money, because we need their dirty cash to keep our economy afloat. There is enough truth in the accusation for it to sting, and enough sensation in it to make a dozen more McMafia-style television dramas.

The police officers tasked with investigating the source of corrupt fortunes know very well that dirty money pays for luxury houses throughout West London. They know too that the money was stolen and laundered. But they haven’t been able to prove…