The introduction of Billy Blastoff in the US with the Space Scout set one year before the moon landing established the platform for all sets to follow. Include several vehicles to show off the one set of batteries runs all vehicles and include both lighted and unlighted accessories. Even at the start with the vehicles being simple stop and go drivers the variety is appealing and there's something pretty classic about the up-leaning purposely wonky walking Lunar Crawler.
Note the Scalecraft variant box cover. As it appears, this is a sticker applied to the regular US box for those sets distributed by Scalecraft. I don't believe all of the Space Scout sets sold in the UK were sold through Scalecraft.