The Ballad of Go Go Brown, because it failed to chart at all.
When Heaven 17 returned, it was 1996. They released 'Bigger than America', another album that failed to chart. You'd think they'd gone for good, but fortunately Heaven 17 found a second lease of life in this century, releasing new albums (a new one is planned for 2015) and even performing live - something they never did in the Eighties.
My collection: 7" single no. 5406
Found: Record Exchange, London
Tracks: 'Train of love in motion' / 'Work'