If a trafficker uses a mule to carry opium across the mountains, then sells the drugs and then sells the mule, is the new owner of the mule responsible for drug trafficking? Abramovich is Russian and the responsibility of the people running Russia. Likewise if the Maffia recycles money into legitimate assets in Italy then trades those assets in London, it's pretty rich for an Italian to try to pin that on London.
The article also talks about British overseas territories as though their laws are written in Westminster. They aren't. All these places make their own tax laws without any reference to the British government. Is this mentioned anywhere in the article? No, instead it's spun as though it's all a Westminster plot. Suppose Westminster did start imposing laws on these territories, would the Independent be applauding this as an example of responsible action or condemning it as an illegal and unconstitutional abrogation of Britain's responsibility to protect the independence of these territories? I think we have a right to know their opinion on that.
Of course Britain has a responsibility to fight crime and work with other governments to crack down on abuses, but we can't singlehandedly be the policemen for the whole world.