Concerning Mikado, I've seen no mention of another alternative SAS delivery method that appears to have been seriously considered. This emerges in Jeremy Brown's A South American War. (The author was Air Attache in Brazil in 1982.) It seems that, whilst at Ascension, and with no prior training or preparation, a VC 10 crew was briefed by a SAS officer to prepare to carry a SAS unit to Belize, where a civilian aircraft would take them on down to Argentina. However, should that aircraft not materialise, the VC 10 would be required to do the job. Things got as far as loading all the SAS kit before a call came to stand down.