I last remember Rosemary advertising products in the ads before movies. She was classy and likeable. (PS Tarn off does actually work as Rosemary described, but who knows what it does to your fine silver?)
If she did not bring down Harold MacMillan's Tory government, the ever so glamorous Christine Keeler came pretty close to doing so in the 1960s. She was, how should I say it, a hostess, and a comforter to foreign diplomats. It seems it did not bring her wealth or long term glamour. She should have been the blackmailer and had a Derek to do her shopping.