AWS operates globally and has set up a branch in the UK for VAT purposes.
Actually, AWS has branches in 18 countries across Europe, so the applicable VAT rules for you, depend on both you and AWS having your “local” place of business in the same EU country. If you are a UK business and you need to obtain a UK VAT receipt from AWS then use the link below. Log in to your AWS account, select the appropriate month and click on the Tax Invoices drop down menu.