Excluding the Germans, were the troops, naval support, equipment, provided by Mussolini sufficient for the Nationals victory? Reading an older history book detailing Italy's involvement, where one author claims that while there was a stand-off between forces through fatigue and depletion, it was the Italians that made a huge difference.
Oh, one more claim; that there was an Italian spy inside the UK government feeding critical strategic info about British intent, or lack, of concerning the Italians military escalation. Easing fears of reprisal