Certainly as far as the list I posted goes I don't think the issue was always whether it was a big hit. "Come Dancing" was actually a big hit in the UK almost reaching the top 10. Their biggest hit post 1970. Whereas "Village Green" made #3 in the list but was a commercial flop as a single. And for women "Celluloid Heroes" was very popular but again was a commercial flop at the time.