OK - So an update
Amazon just replied > Dear Associate,
Thank you for agreeing to transfer the ******-****.COM, ******************.US, ****************.COM, ******-******-***.COM, ****************.ORG, ******-****.NET, *****-****.ORG, AND ***************.COM domains to Amazon.com. We'll have our domain administrator contact you soon regarding transfer instructions.
We value our relationship and appreciate your cooperation and prompt attention to this matter. If you have any questions or wish to discuss the matter, please use the Contact Us form available on Associates Central.
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I have had several C&D's before, never any as civilised as this - Hat's off to Amazon !