Hooray henry

This is interesting. Starting with "Lazy Susan" and adding a little "naff" we now are at "Sloane Rangers" and "hooray henry types". I found a "Sloane Ranger Handbook" online and based on that can speculate on the attributes of the "ranger" culture. However, "hooray henry" wasn't as clear. Though I'm clearly in no danger of meeting either (nationality, class, wealth and geography among other small impediments), I am curious. Further definitions anyone?

The in-crowd (presumably) having gone to bed, a still-alert Pacific Rim type found "hooray henry" in the Meanings & Origins section of this website.

And a still alert, midwestern type thanks you. Any more on Sloane Rangers? They sound similar to characters in old Joan Collin's movies. Or, moving the modifier, to characters in Joan Collin's older movies.