A large bird with a population in the hundreds of thousands is not endangered. There has been a decline over the long term, but the population has been actually been increasing over the last decade. Shooting of grouse has declined dramatically in popularity over the last century. The consequence of that is that large areas formerly managed in order to maximise red grouse populations have been abandoned (so that old, woody heather unsuitable for grouse, or scrub and/or or bracken have taken over) or planted with conifers. Fewer gamekeepers means that there are more natural predators around (which is precisely how it should be - shhh, don't tell Sir Ian), which prevent populations from staying artificially high as they are on those carefully-managed grouse moors. So can we please have a bit less of the Daily Mail-style hyperdrama and a bit more of sticking to the facts. There are plenty of red grice in Britain and always will be as long as suitable natural habitat remains available.

By the way, upland mismanagement by way of bad grazing practice is entirely responsible for bracken spread. That's very unfortunate, as bracken is next to useless as far as biodiversity is concerned.