Common fuel versus fleet reconstruction

What if the Royal Navy had adopted diesel for ships and aircraft after the First World War?

Logistics might improve, but achieving the required speed would require an expensive fleet-wide engineering programme.

The answer separates the attraction of a common fuel supply from the engineering burden of obtaining fleet speed. Diesel aircraft engines would bring their own altitude-performance tradeoffs, so common fuel would not make every platform automatically better. For high-speed warships, Britain would probably need diesel-electric machinery rather than a simple substitution of engines. Converting the preserved capital ships would therefore become a large and expensive reconstruction programme. The logistical simplification is real, but it has to be weighed against changes in aircraft tactics and the cost of rebuilding much of the fleet.