Dear Actus...I strongly agree regarding the D/Cut. I was delighted with it and felt at the very least it provides an alternative viewpoint.
When I googled the R4 interview (which I'd not previously heard) I was actually looking for a more recent one on "50 Words" that was recorded weeks ago, but this one was especially interesting.
In the way that Kate says she is never satisfied and constantly feels a desire to rework the material, she is fast becoming the new Gustav Mahler (:-)
(Meant in a kindly way to both Mahler & Kate...)
I don't think the composer would be offended if you went for the CD version. The only note of caution is that there may be remastering differences between the 2005 and 2011 versions. Kate took a loooong time thinking about the 2005 version, so, to me at least, Aerial is a finished masterpiece(?) and it worries me that they may have have tinkered with Disc 2.
Websites appear to show the tracklisting on CD2 with a single title "An Endless Sky of Honey".
The original had 2 main titles :
CD1 = A sea of Honey
CD2 = A sky of Honey
The following are the original titles of each "movement" on CD2 in their correct order :
Prelude
Prologue
An Architect's Dream
The Painter's Link
Sunset
Somewhere in Between
Nocturn
Aerial
Hope this helps...