Guardian article on the change of parts of the British uplands into low biodiversity regions dominated by Molinia caerulea (purple moor grass). Presumably different parts of the uplands to those being overrun by bracken.
There’s an invader turning huge swathes of Britain into deserts – and these dead zones are spreading
On reading elsewhere [purple moor grass and rush pasture] (Purple moor grass and rush pastures - Wikipedia) is a rare habitat under threat. It’s a species rich habitat so presumably different from the monocultures the Guardian is raising the alarm about.
See also How do you solve a problem like Molinia? – The Applied Ecologist.