My era but don't remember it, strange as i used to watch ( & have since bought) the complete boxed sets of Thundered birds, Stingray and Captain Scarlet. Shame it not available. 1 of My friends kids love watching my 'old' uk TV DVD's even though there in English (Kidz are French). The little one first got into the Clangers when he was only 3, by 5 was happy watching Mary Mungo & Midge. Amazing he now knows words in English that he doesn't even know the French for (like Crane,hammer, screw driver... tumble dryer- he's now nearly 9).
Your right there is loads of old 70's kids Tv series that todays kids could learn from plus be entertained.