Sark has a special case in the history of tax haven abuse - once being well known for what was called 'the Sark lark". It was rumoured that the then postman (there's only one) was a director of over 2,000 companies, none of which, I suspect, he knew anything about.
But the lark continues - in a different way. Now it's a take of oppression of local opinion, diversity and enterprise by the Barclay Brothers - who want to make it their "company town".
In microcosm it's a tale of what happens when a group or interest get too dominant.
Of course, banking is doing the same to the UK as a whole: it's just easier to spot in Sark.