Although filmed in England in the summer of 1960 under the title "The Star and The Cross", it was for some reason kept on the shelf and not released in the UK until April 7th, 1963, by which time the title had been changed to "Hand in Hand (1961)" and it went out on release on the ABC circuit as the supporting film to the Tony Hancock comedy "The Punch and Judy Man (1963)".
Of course, this delightfully-innocent and lax-security-steeped movie was filmed "'way back in far-more-casual-and-liberal times" --- the concept of these youngsters just hopping into a car with a total-stranger lady would never fly today. Nor would they be allowed to "roam wild, wide, and free, so long as they got back home before dark" nowadays.