I don't think its from an Eagle Annual, unless one of the later 1960s or 70s ones.
That engine reminds me very much of Frank Whittle's engine that was in the Gloster E.28/39.
It wouldn't be from a Ladybird Book, would it?
It does have a look of ladybird tone. Sat on train commenting. Moonbase is mobile!
Could it be from Look and Learn?