Here's my mockup of the Leander concept from BAE/CL (be gentle, its my first drawing, but any criticism welcome).
-Oto Melara 76mm
-2 DS30M mounts from the T23
-Various miniguns and GPMGs
-18 Sea Ceptor silos (12 fore, 6 amidships) with space for more
-8 canister launched AShW missiles (Harpoon as placeholder)