Mussolini's fleet mattered because of Mediterranean geography

Were Mussolini's ambitions for Italian control of the Mediterranean contrary to British interests?

Yes; Britain might dismiss Mussolini personally, but a capable Italian fleet occupied a strategically disruptive position across vital Mediterranean routes.

British strategy could not ignore a fleet simply because its political leader appeared boastful or erratic. Italy sat astride routes connecting Gibraltar, Malta, Suez, and the eastern Mediterranean. A capable fleet in that position could threaten communications and force the Royal Navy to divert major resources. Italian importance came from location and available ships more than confidence in Mussolini's leadership.