What the Royal Navy learned from battlecruiser losses

How much did the Royal Navy learn about interrupting fire and blast paths after its battlecruiser losses?

A great deal; it introduced layered safety measures, while Hood's loss still resulted from an exceptionally destructive and improbable hit.

The Royal Navy adopted extensive safety measures rather than ignoring the loss mechanisms revealed by wartime experience. British carriers' multiple protective layers around aviation-fuel lines reflected the same concern with stopping fire from spreading. Hood's destruction appears here as an exceptionally unlucky penetration rather than proof that no lessons had been learned. A small change in the hit location might still have produced severe damage without the same catastrophic result. The loss also shook Prince of Wales; a damaged Hood still fighting might have given her crew a different psychological problem to solve.