Yes they aren’t pure anthracite though only a small percentageI've used the welsh one, I think it is called Stovesse? (It is a little pricey). The one I am using at the moment is Burnwell Blend briquettes, I use a mix of both! The Homefire stuff is awful, i've found no heat at all and too much ash.
We use our anthracite on ours at home it’s the cleanest burning coal by far, we can’t even see any smoke it’s so clean.