Not out of business - in fact owned by L'Oreal, the world's biggest beauty company - but they no longer retail in UK as the results were poor. But you can still buy it in other countries.
I don't think Charlotte Tilbury is still associated with H. R., but if you like her stuff, have you looked at the myface makeup range which she worked on - you can find it in Boots. Plus I think she's consulted on the forthcoming Tom Ford Beauty range.
They did the best red lipgloss I have ever found, and great mascaras.Also the face creams were pretty good.Then just after the Charlott Tilbury colours and new packaging came out,they disappeared. I will check out the my face range,I haven't seen that,my local boots is teeny. I haven't looked at the Tom Ford stuff but I know they have it in Selfridges.