Could this help?
Got a US Kindle Fire HD 7" / 2nd Gen Fire - Here's how to get UK services and apps
First up, you will want to download and install the latest software update:
Kindle Fire HD 7" software update version 7.2.1 from Amazon here :
http://www.amazon.com...
Kindle Fire 2nd Gen software update version 10.2.1 from Amazon here :
http://www.amazon.com...
The update doesn't seem to be available from the auto update system at the moment, so you will need to download it and transfer it yourself. The file is 536mb so it may take a little while to download.
Once you have the file on your computer, you need to transfer it to the kindleupdates folder on your Fire HD. If you can't see the Kindle Fire when it's plugged into your computer, you may need to download some additional software here:
http://www.kuforum.co.uk...
When the file has transferred, pull down the system menu from the top and go to More and then Device > About > Update your Kindle and the software update will begin.
Once the software update is installed, pull down the system menu and select More > Language and Keyboard and make sure these are set to the UK settings.
If you are not seeing the UK app store, music and movies when you try to access content, you may need to do one or more of the following :
1. De-register your Kindle Fire and then re-register it to your account. To do this, select More > My Account > Deregister and then choose to re-register to your UK account.
2. Turn on location services so the services know where you are located : Go to More > Location Based Services > Enable ...
The UK appstore, music, and everything else should all be fully functional now. Happy Kindling Big Grin