User blog comment:I am that guy/Fun Fact: the British 18' gun/@comment-14850713-20140103072837

Yes, Furious was one of "Fisher's Follies", together with her half-sisters Courageous and Glorious (w/c were armed w/ 15 in. guns). They mounted heavy guns but very minimal armor as part of Jackie Fisher's fascination with big, fast (due to light armor) but heavily armed ships (they were classified as "large light cruisers"), which was carried to the extreme with Furious.

Btw, thanks for the help IATG!