Just a thought. If we leave out Nelson, Rodney and the other WW1 battleships because they are too slow for a modern engagement as well as Renown & Repulse because of their weak armour and concentrate on the modern WW2 ships and we had for the RN,
one Lion, and the five KGv class + a carrier and the usual destroyer escorts and for the Kreigsmarine
one H class, Bismarck, Tirpitz + Scharnhorst and Gneisnau rearmed with 15" (would it be 6 x15 or 9 x 15?) and Graf Zeppelin as their carrier + destroyer escorts.
How about that for a fleet action?