There is a mention of the RN being prevented from participating, but I forget the exact reason
The entire RN Home Fleet goes blind drinking cocktails made of a mix of Red Lead paint, Asbestos and bootleg Gin whilst smoking cigarettes in the powder magazine. Or more plausiblly the Tharingian Plasma Battle Fleet from the Orion Nebula sign an alliance with Hitler and drop Photon Torpedoes on Scapa Flow.