"Hi Tarquin! Here it is necessary to look longitudinal section. By location tabula can see it is Chaetetes or Tabulata."
Hi Valerij! - true, although 0.5mm suggests Chaetetes, and it is likely to be Carboniferous from there.
New ones: the first is Siphonodendron, S. junceum I think as the structure looks very simple - what's the corallite diameter?
For the solitary ones, I'm afraid ID isn't possible without sections. Nice specimens!