Amazon isn't intentionally discriminating against your country, they don't have a choice.
I'm just not sure why people in the UK would go for this when the Library already does a fine job of "all you can read".
[1] http://wilbor.lib.overdrive.com/826F0311-F3BF-4487-A2D0-CA70...
Or, get on the board of your local library.
A few will let you take your eReader to the physical library and help you put books on there.
They CHOOSE not demand their books to be available globally from publishers.