The Royal Navy's practical and emotional response to Pearl Harbor

How did the Royal Navy react practically and emotionally to Pearl Harbor?

It saw a major strategic problem and felt sympathy, alongside the thought that Taranto had already shown what carrier aircraft could do to battleships in harbour.

The practical British reaction was that the attack would create serious new demands for a Royal Navy already fighting a global war. Emotionally, sympathy for the American losses mixed with a sense that Britain had already demonstrated the danger at Taranto. The response avoids triumphalism. An ally could experience the same event as a human disaster, a strategic complication, and confirmation of an earlier operational lesson.