Thanks, Furry. Very interesting. I looked it up and it sounds to me like the Blue Books were the result of a well intentioned, but poorly conceived, study that was poorly carried out by prominent but unqualified researchers. Such things never end well. Sad. I still don't understand why modern Welsh people would be hostile to the Welsh language though.
I've always admired anyone who has mastered more than one language ... I have trouble enough with one.
I'm told by my reading-specialist wife that children who are exposed to a second language at a young age have a greater ability to master multiple languages later in life. I would think this would be an advantage, especially in your part of the world.