There is a huge discrepancy between the huge list of Alexa “skills” available in the US, and those available to us using Alexa on the other side of the pond. In encouraging news this week, Amazon looks set to automatically create UK instances of existing US only skills.
Amazon have emailed developers (yes, I registered as a US developer early on) to say that the migration will begin on Feb 16th. Developers can opt out, but unless their skill only makes sense in the US, I don’t see why they would.
As you’d expect, Amazon have a comprehensive FAQ on all this.