Thank you for your reply.
First of all, use the procedure below to reset your Amazon account password.
1. Please go to this URL web page - click here to reset your password
2. Enter your email address
3. Type the code from the picture
4. Click Continue
5. Open your email box. There you will find email with subject "Amazon.com Password Assistance". Open that email and click on the link that will allow you to reset your Amazon password.
To buy books from Amazon UK you will have to change your country and address using procedure below. This kind of issue happens when your account is registered for one country (e.g. UK) and you are living in another country (FR in your case).
1. Open web page below - click here
2. Click Settings
3. In "Country Settings" select "Change"
4. Enter your full UK address and be sure to select UK for your country
5. When done click "Update".
Please don't hesitate to ask if you have any difficulties. I will be happy to help with any follow up questions.If you have any difficulties or you need more information please do not rate my answer negative BAD service or POOR service. Reply to me using "Reply to Expert" button and I'll provide you with more help.