Concept, design and built all very much WW2, but HMS Vanguard was not accepted and therefore not commissioned until after the war was over. At that point, because of the lessons learned in the war and the omnipotence of the aircraft as a cheap, ubiquitous and devastating weapon, she was obsolescent from the very first day of her active service. However, see below to the plans for a 1945 British Battleship.

Like the HOOD, she was the only one of her class and also had eight 15-inch guns mounted two per turret, AB turrets forward and XY aft. They were also just about the same full load displacement at 48,000 tons, slightly heavier than the KG V class of battleships. However, she differed from the HOOD because she had 5.25-inch secondary armament whereas HOOD had had hers removed in favour of 4-inch quick firing [QF] Low Angle {LA} [against surface and shore targets] and High Angle {HA} [against aircraft] guns.

Anyway, it is the 'gun busters' turn to enjoy one my web pages, so here goes with the FIRE CONTROL SYSTEMS, main and secondary, of HMS Vanguard  whose radio international callsign was GGFP; in those day GEORGE GEORGE FOX PETER.

HMS VANGUARDS FIRE CONTROL SYSTEMS.pdf

Vanguard in 1960, bows on touching the sea wall at the 'Still and West' harbour entrance public house whilst being towed to Scotland for breaking up. At least her 'X' and 'Y' turrets and her quarterdeck are out of harms way and standing as proud as ever, and this one taken from the building on the Portsmouth Hard

It is not commonly known but with WW2 looking to drag on into its sixth year, the Admiralty had firm plans to build  additional battleships and they were to be called HMS Lion and HMS Temeraire. This is a picture of those ships.

 

Note that 'X' and 'Y' turrets are 6" guns only.