The first page is a cannibalised page used for the 1974 Dan Dare Annual reprint and is a combination of two different pages from Safari in Space (bottom half of Vol. 10 No. 16 page 2 and Vol. 10 No 17 page 1).

Second page, as mentioned, is a fully-intact page 1 from Rogue Planet (that I used to own).   

Third page is a Project Nimbus from Vol. 11 No. 25 page 2. Principle artist is Don Harley, though the spaceship art in panels two, four and five look Bellamy-ish (though I'd learn towards Harley and/or Bruce Cornwell trying to emulate Bellamy's hardware).

Fourth page is another Project Nimbus from Vol. 11 No. 24 page 2, again principle artist is Don Harley (with another Bellamy-ish spaceship in panel five).

I'm sure there's nothing new for you, here, but others following this thread might find it of interest?

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Yes, I knew all this. Several of the pages are "cannibalized," and from "Nimbus" I have a couple more that are part Bellamy, part Harley. Looks like the finishes on the latter might be Bruce Cornwell.

The chopped up pages are crazy! The art was actually peeled off the original boards, and pasted onto new backing! Some of the panels were "reshaped" for the new format. (One "Terra Nova" page has the large panel that was beside the logo reduced to a strip cut thru the middle third!)

Still, it's the art I'm after, and if these are the only forms in which they now exist. . .