F or decades the Channel Islands tax haven of Jersey has played a big role in moving fortunes made in some of the world’s most despotic countries into the west, attracting overseas oligarchs with a mix of low tax and high levels of financial secrecy.

It is a secrecy that extends to Jersey’s relationship with the UK government. As a crown dependency, Jersey has its own parliament, but belongs to the king. The relationship between the two jurisdictions remains something of a black box, with very little public information on how the big decisions are made, or to what extent Westminster is consulted.

That changed last week, when Jersey itself released the details of a two-year legal battle with Roman Abramovich, the Russian billionaire and former Chelsea football club proprietor. On Mon

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