The contents listing seems to be out of sync. This one actually contains:
The Diemos Deadline (as shown on the cover);
Captain Diamond takes a Holiday;
The Ninth Moon (the first and last story look like Ron Turner art to me)
By SuperScrounge
The GCD lists the book with this cover as number 6, not 3.
By paw broon
As Andrew points out, the Captain Diamond story is wrong in GCD. Also this is #6, I think.
#3 is Captain Diamond and The Space Pirates, and The Space Crusader by Norman Light. Cap Diamond is attributed to Turner but if that's right the art is quite crude.
The old British Guide conflicts with the sci-fi entry on Archive.org as to the numbering.
I still can't figure out what the number order is.
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