I thought it would be much closer possibly a PR win because most people think there should be a different system if asked but when presented with actual choices they tend to see FPTP as the lesser evil.
As I understand it there were 2 questions. First was on changing to PR, and second was what form of PR. The 42% response rate was to the first question, much lower response to the second; probably those who wanted FPP didn't respond to the second.