Why did the Royal Navy ultimately reject the E-2 Hawkeye?
Short answerBecause it was intended for CVA-01; with that carrier cancelled and Eagle and Ark Royal nearing retirement, the purchase no longer had a viable fleet role.
NotesThe Royal Navy considered the Hawkeye in connection with CVA-01 rather than as an isolated aircraft purchase. Eagle and Ark Royal were already approaching retirement, making a new type for their final years uneconomic. Once policy ended the conventional carrier program after those ships, there was no deck and no enduring air group for the Hawkeye to serve. The aircraft was therefore rejected by the collapse of its carrier context, not by a simple judgment that the design was inadequate.