Today's free Android App from Amazon US is not the same as the UK one.
Haven't looked at it in any great detail but should hopefully be useful during one of the many rainy days we are likely to get this summer holiday. List price $2.99.
For anyone who doesn't know, all you need to do is access Amazon.com on your computer and it should recognise your UK account and allow you to 'purchase' the app. It should then be added to your My Apps list on your android device.