Re Guernsey and Jersy etc. The Islands are 'British Protectorates'
They are outside of the EEC and residency rights require you to have been born there. Here's the kicker. If you have enough money you can live there. Guernsey requires you to be native or to purchase housing over a certain rateable value (LOTS). Jersey lets you live there but you can't own property in your own right unless you have lived there for ten or more years.

I am a Guernseyman who has lost the right to return to my place of birth to live because I have lived away from the Islands for a long time. This makes me a displaced person (doesn't it?) I live in Britain and have a British Passport. So unless I can conjure up a couple of hundred thousand for a house I am stuck with Britain. (OH JOY!)