The other two sisters of this class, HMS Courageous and HMS Glorious as originally completed.
HMS Courageous in spring 1917 with minerails for up to 222 mines, but she was never used as a minelayer.
HMS Courageous later in 1917 with extra torpedo tubes fitted and minerails removed.
HMS Glorious in 1918 with turret platforms added for Sopwith Pups and anti-splinter matting over her bridge spaces.
Also, a revised Furious in 1917 and in 1918 with a new crest thanks to Kim and BH's research.