That's the one I was looking for I knew I'd seen it.When you look in the archive it comes up as a Van Speijk/Leander.I thought at first they were the same but my book says the Campania was longer with a shallower draught.
You're quite right. The three ships of the Nairana class were of a similar, but not identical design. They were build in three different shipyards and Campania was 540 ft long, Nairana 528 ft and Vindex 524 ft.