So back then the Stratocaster was synonymous with Hank Marvin, and many stores here even advertised Strats as "The Shadows guitars" as a marketing gimmick when they started selling them (I've searched through old news papers in looking for old Fender/Gibson advertisements).
Hank Marvin was also the leading reason for Fiesta Red being such a popular color here. Many stores selling distributing Fender offered the custom colors (Sunburst was the standard color) where they'd repaint your Strat in red.
Then Beatless came, along with the other big bands (Stones, etc.) and artists (Hendrix), which made guitar music very common and popular.