Possible Clues:

• One film, as shot - it's directed by Douglas
• Its capital is Douglas and its cats are tailless
• Felons aim to resettle here?
• There's no end of cats here
• Human ground between here and England
• Where to find the House of Keys
• ... not welcome here?
• Its cats are said to be lacking tails
• Where is Douglas Donne denied?
• Perhaps it's only human to find it in the 17 down between Ireland and England