To be fair, the Turbomaster advert did not get shown for all that long. Maybe Hoover intended to launch an advert for the Turbopower Freedom but held back as a result of the problems keeping the dust where it should be. Joan Sanderson and Prunella Scales were very much actresses of the moment as they were starring in an excellent radio comedy called After Henry, which had been transferred to television and was being shown at the time of the Hoover advert.
I do wonder also if Hoover pulled the TM advert to avoid selling more of these cleaners.