He knows what it means to hang up your life in the closet and pack your heart and health and conscience into a carry-on bag, and then set out for the airport and never look back.
While the royal party have lunch at Castle College in Stornoway, we pile into a nine-seater light aircraft and set off with a carrier bag of ham and chicken sandwiches.
He's looking set to steer the Conservatives onwards for the next few years but it's not in the bag yet, a week is a long time in politics and there are conflicting polls as well, so let's talk to the man himself, Iain Duncan Smith has magically slid into the sofa while, while I was doing that introduction.