British wouldn't agree to it is all. The bulk of Norways ships escaped continued to fight along side the British. RN would do the same. British still had their base at Gibralter.
& there was no entirely British prong at Torch, in fact their participation was much smaller than US.
The Allies planned a three-pronged amphibious landing to seize the key ports and airports of Morocco and Algeria simultaneously, targeting Casablanca, Oran and Algiers. Successful completion of these operations was to be followed by an advance eastwards into Tunisia.
The Western Task Force (aimed at Casablanca) comprised American units, with Major General George Patton in command and Rear Admiral Henry K. Hewitt heading the naval operations. This Western Task Force consisted of the U.S. 2nd Armored Division, the U.S. 3rd and 9th Infantry Divisions—35,000 troops in all. They were transported directly from the United States in the first of a new series of UG convoys providing logistic support for the North African campaign.[3]
The Center Task Force, aimed at Oran, included the US 509th Parachute Infantry Battalion, US 1st Infantry Division, and the US 1st Armored Division—18,500 troops. They sailed from Britain and were commanded by Major-General Lloyd Fredendall, the naval forces being commanded by Commodore Thomas Troubridge.
The Eastern Task force, aimed at Algiers, was commanded by Lieutenant-General Kenneth Anderson and consisted of two brigades from British 78th and the US 34th Infantry Divisions and two British Commando units—No.1 and No. 6 Commandos; in all a total of 20,000 troops. During the period of the amphibious landings the force was to be commanded by U.S. Major-General Charles W. Ryder, commander of 34th Division, because it was felt that a U.S.-led invasion would be more acceptable to the French defenders than one led by the British.
http://en.wikipedia.org/wiki/Operation_Torch