Why the Hercules-powered Avro York did not become standard

Why did the Hercules-powered Avro York C.II not become the standard wartime York?

There were difficulties obtaining enough Hercules VI engines, and competing projects may also have absorbed the available production.

The Hercules-powered Avro York C.II faced difficulty obtaining enough Bristol Hercules VI engines. Competing projects are suggested as another demand on the available engines, although that recollection is tentative. By the time this alternative was being considered, attention was also moving to other projects.