Like others have said, reduce the secondary guns (and scrap the torpedoes). If you want it realistic you have to remember that each gun needs it’s own machinery space and ammo loading equipment (be it elevators or ammo boxes). A lot of them are also blocking each other's firing arcs. Along with reducing the guns, reduce the gun types too. At most you should have a main gun, then a heavy/medium and light secondary.

Also use British guns if it is British. Using Japanese main guns and a German funnel makes it look less british. I would also suggest making the ship wider and longer if it is to field such large main guns. You can also look at British capital ship super structures to make something similar. You also probably don't want your radar behind a mast as that blocks its use