Update 3: The Enid Blyton Secret Series - woman

 

I now have completely re-checked all 20 episodes. In The Secret Mountain - part 2, I found Michele Amas (1961-2016) as Ruby in blue bibs. A brief scene at 16 minutes, also from a distance, but partly behind the table. But obviously a long pair. Tools in bib pocket. 

Another better pic of Laura in pink shortalls sitting and standing up in The Secret Island - part 1. Also in another episode (see main entry) and also in white shortalls. But rather few good scenes.

Some later episodes are more exciting. But most settings are very poor. And most grown-ups annoying (especially the scenes of dad and the short-haired lady).

Main entry rating 9 (boy)

https://biboverallsfilms.blogspot.com/2011/08/enid-blyton-secret-series.html