I mean, for a given value of success... Hutt was allowed to continue in as much as their declarations of independence didn't really mean a lot, and he lost nume

I mean, for a given value of success... Hutt was allowed to continue in as much as their declarations of independence didn't really mean a lot, and he lost numerous court cases showing he did indeed owe tax. In the end it was dissolved and the land was sold off to settle the tax bill. From where I'm standing (about six hours drive from the Hutt River), Sealand looked way more successful, with some actual court recognition it was outside of UK jurisdiction at various points.