Here are a few photos of a seed grown succulent that popped up in one of the cacti that I purchased from Hamiltons' Cacti. My thinking is that it is an Echeveria of some type, but may be some obscure genus which is unfamiliar to me.
Have a look and see what you think, comments are most welcome.
Just answered my own question, it's an Anacampseros, probably the species rufescens.
I came across a picture of the same plant on eBay, totally unexpected.
As suggested before, this is a genus previously unknown to me, from Africa