The paperback edition of Third World War: the Untold Story has the chapter about NATO losing the war.
I first read the book in 1981, when my local library branch had a copy (I was 11 at the time). Got the paperback editions of both when they came out and still like reading them from time to time.
Looking back, Hackett's goal was to get the West to spend more on conventional warfighting and plan for a non-nuclear war in Europe, instead of going nuclear within a few days. "If you want nuclear peace, prepare for non-nuclear war" was the push here.
It does make one wonder how things would have gone with no Gorbachev and a hard-line Soviet leader in the 1980s.