[quote name='hmbtnguy']Wait are you sure? I just checked highdef digest and it states that the Discovery version is 1080i while the BBC version is 1080p.[/QUOTE]
Unless the letter is a fake. I'll try to find the post.
On the amazon discussion page:
http://www.amazon.com/Official-1080...t_tp?_encoding=UTF8&asin=B000MRAAJM&store=dvd
This answer comes directly from BBC:
"Thank you for your email. To answer your query in detail. The USA version of Planet Earth released in April 2007 was encoded at 1080 59.94i, the UK version released in November 2007 re-used exactly the same encode.
Unfortunately there is an error on the USA packaging incorrectly describing the video stream as 1080p (the format common in for feature film releases). If you perceive a difference, there isn't one, as it is all interlaced material.
It might be helpful for you to know that all HD programmes made for the BBC have to be delivered in 1080 50i regardless of capture format. In addition due to the fact that all the players in the market right now are only guaranteed to play US frame rates we had to make a conversion to 1080 59.94i for these releases. This situation may change during 2008, but we have to put a product in the marketplace that is guaranteed to play on every player and not just some.
With regard to the content, it was decided not to put the "making of" documentaries on the US & UK HD-DVD & Blu-ray releases as most of the content is filmed in SD which would not upconvert well. The UK release also contains two additional programmes which had not been completed in time for inclusion on the US release.
I hope this resolves your query. If we can be of any further help please do not hesitate in contacting us. Kind regards."