If Britain knew the exact time of Italy's declaration of war, would the Royal Navy strike the Italian fleet at anchor first?
Short answerYes. The Royal Navy would probably seize the chance for a Copenhagen-style pre-emptive attack.
NotesThe Royal Navy would exploit a reliable opportunity to neutralize the Italian fleet at anchor. This fits the service's historical willingness to consider Copenhagen-style action. The answer also compares Wilhelmshaven, where naval action was delayed because the RAF claimed the target. It shows how foreknowledge, inter-service allocation and the fleeting chance to catch a fleet in port can shape pre-emption.