Someone was asking "What about Dan Dare?" This was not an Eagle Annual but rather a special publication about spaceflight. Dan Dare was the comic strip space hero in Britain in the 1950s and 60s. His adventures are worth hunting down.
Morris, Marcus and Hampson, Frank. Dan Dare’s Space Book. London : Hulton Press Ltd. (69 p.) 27 cm.
The "annual" was devoted to the fictional hero Dan Dare with fictional stories and comic strips. But it also includes a number of non-fiction articles about space flight including an essay by Arthur C Clarke "Is Space Travel Possible?" with illustrations by Chesley Bonestell and an essay with photographs about the V-2 testing at White Sands, NM.
One of the big treats are the 8 color (or colour) plates. Here are three of them: