Thank you for the welcome!
Chelle thank you for all the info, really appreciate it. Going to find something that's fast draining like you said. I'll definitely try and ensure it gets more light too. I've obviously not been giving it enough.
Having looked at your link valleylyn I may have changed my mind about the sedum. Gosh that looks similar, even down to the reddish tint on the stalk.
So it appears to be from South Africa, and here is mine living in the "tropics" of the UK ...and I'm wondering why it's floundering! I'll give it a bit of TLC now I know a little more and fingers crossed it will grow better.
Thank you again everyone for your help. Maybe... in another 10 years...I may even get it to flower