There's been no movement from Amazon, unsurprisingly. I assume they have had their lawyers make as certain as they could that what they were proposing was legal under EU legislation: the same change will also apply to Amazon in France and in Germany.
I suppose in a way I am lucky because I can manage to extract myself from Amazon and only (only!) lose 20% of my income. There are many, many booksellers who cannot possibly afford to leave Amazon and so will have to comply with this policy. Anyway, I need to take up the slack somehow, so am going back to listing books on Ebay. I stopped doing this in August last year after Ebay imposed a free postage policy on sellers in many categories, which included books. They have now decided this wasn't wise, so I shall trot back into the arms of Ebay. Watch this space.