My order for "Planet Earth - Special Edition [Blu-ray][Region Free]" has been cancelled by Amazon.co.uk since they could not procure the item. It appears that their supplier has informed them that the item is no longer available and they asked me to try other sellers. I don't know if that means the Blu-ray is no longer available forever or just the near future?!
Don't lose heart; the stock is dynamic. It'll be back soon.