I don't think many would argue that the BBC could do better when it comes to coverage of folk music of any sort. But Mike Harding is not the only offering, there's Genevieve Tudor's programme on Radio Shropshire for example. There's also The Music Well aka Britfolk.

But to argue that "English folk songs and folk music are discriminated against, less learned, less studied, less performed and less propagated" on the basis of the BBC's deficiencies just doesn't follow.