G126 - The range and payload of the Tornado wouldn't have contributed much that wasn't already there in the form of the Harrier GR.3's and Sea Harriers. Operating from Ascension would have been the only option and a Tornado bombload would have been incredibly small in comparion to the Vulcan.
I do know that groundcrew from a Jaguar squadron were tasked to get ready to deploy in the immediate hours after the invasion. When the location was fully understood - the order was quickly cancelled.
Prior to the war we were about to retire HMS Endurance and the Argentinians obviously thought were wern't that committed to the region.