Marx Toys, Britain's, Meccano, Bayko, Sylvanian, etc. The list of British toy brands which have disappeared or been taken over by other companies with a different vision is ever growing, like the list of British manufacturers generally.
But for successful toy companies like Lego and Geobra (and Mattel, Tonka, etc) success seems to depend on that Black Art, Marketing (aka selling stuff to people who didn't know they wanted it). Children form a big potential market. Lego have practised Marketing on Children very successfully, exploiting the numerous opportunities for licensed products presented by film spin offs and the like.
Geobra are not as successful, perhaps because their Marketing Practices are less bullish, perhaps because Playmobil had not until recently dabbled in licensed movie tie-ins. And perhaps because they really don't see Making Money as their primary goal (They Don't Like Money, as Tahra puts it!), though I doubt that view will long survive the passing of HOB, if it ever existed!