The Royal Navy's unofficial capital-ship requirement

Did the Royal Navy conduct a capital-ship study comparable to its cruiser requirement study?

Not officially under the treaty system, but its rapid post-1937 call for 25 capital ships indicates that unofficial planning had been done.

The question compares the famous cruiser requirement with planning for battleships and battlecruisers. No equivalent capital-ship study was officially produced while treaty limits made the subject politically constrained. The speed with which the Navy announced a requirement for twenty-five capital ships after the 1937 treaty suggests that substantial thinking had nevertheless occurred. The distinction is between a published formal study and an institutional requirement prepared out of public view.