Why Britain would decline loaned Fletchers

Would the Royal Navy want a carrier and a flotilla of Fletcher-class destroyers on loan?

It might accept the carrier, but the Fletchers would duplicate British destroyers while imposing a separate support system.

Britain would have little reason to want a flotilla of Fletcher-class destroyers on loan. The Royal Navy already had fleet destroyers and was producing more of its own. Adopting a separate American class would require different machinery support, spares, training, and maintenance for little unique gain. Britain might accept that burden for a high-value capability such as an aircraft carrier, but not for destroyers that duplicated existing roles. Interoperability is a logistical calculation here rather than a judgment that the Fletcher was a poor ship.