He hopes to enter the history books yet again by becoming the first person to cross both polar ice caps and climb the highest mountain on every continent on Earth.
The latest death-defying adventure will see him attempt to scale four mammoth peaks in 10 months, having already reached the North Pole and South Pole in 1982,
However he still wants to be first to cross Antarctica in the depths of winter, having failed during an attempt in 2013.
Foreign and Commonwealth Office (FCO) guidance says the British Antarctic Territory is inaccessible during winter months - March to October - and permits may be required for travel to the icy wilderness.
A spokesman said: "There is not a blanket ban on travel to Antarctica in winter, but it has to be safe.
"Sir Ranulph Fiennes is a great British explorer who we can be proud of and in 2013 the FCO gave permission for Sir Ranulph to travel there in winter, but unfortunately, as was widely reported at the time, he had to abandon that expedition."