Millin saw further action with 1 SSB in the Netherlands and Germany before being demobilised in 1946 and going to work on Lord Lovat's highland estate. In the 1950s he became a registered psychiatric nurse in Glasgow, moving south to a hospital in Devon in the late '60s until he retired in the Devon town of Dawlish in 1988.
Millin continued his service with 1 SSB in both the Netherlands and Germany before being demobilized in 1946. He then worked on Lord Lovat's highland estate, followed by a career as a registered psychiatric nurse in Glasgow during the 1950s. In the late '60s, he moved to a hospital in Devon and retired in Dawlish, Devon in 1988.