I see no images, Mr. Croft.
I nominate the post-Napoleonic Palmerston Sea Forts in the Solent off Portsmouth, England (Spitbank, St. Helens, Horse Sand & No Man's Land), as well as Guy Mansell's WWII Army Forts in the Thames (Nore, Red Sands & Shivering Sands) and Mersey (which probably also had names.) Maunsell's Thames Navy Forts (Rough Sands, Sunk Head, Tongue Sands & Knock John) might also qualify.