"Flop" might be a tad harsh, it was top 30 in a period when his singles performed quite patchily anyway for whatever reason. That lull lifted come the 80s.
Maybe harsh I just checked . Number 12. Did better than I thought . It is generally considered his masterpiece though and people are often surprised that it didn't break the top 10. It should have done better and that TOTP clip did not sound good. Now you mention it he didn't do so that well singles wise for a few yyears until he did scary monsters. Although he in he didn't have as many big hits as people imagine. He went right out of fashion by the mid eighties until his Glastonbury performance in 2000. . Never out of fashion with me I hasten to add . That Glastonbury show was one of my "I was there" moments. There , I Just had to find an excuse to fit that one in!!