There are two that spring to mind straight off Mike. One is "The Planets" that you have already mentioned and the other " The Universe" is much the same, infact they rehash some of "The Planets" but there is still a lot of good stuff in it.
Another that you might want to have a look at if you can get it is "The man who coloured the stars" about the photography of David Malin. A visually stunning video if hard to get.
Good luck
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