What is this succulent?

Grew this from a single leaf but have no idea what it is!
Anyone out there know?

 

@Michael Hewett would know. Hopefully he will drop by soon.

 

Highly uninformed and underwhelming guess .. Kalanchoe of some sort maybe?

 

There are a lot of different Kalanchoes, but that was the first thing that came to mind for me. From the picture I can't see whether the foliage is smooth or furry. If furry then maybe Kalanchoe tomentosa. If not a different Kalanchoe is most likely.

 

Kalanchoe tomentosa gets my vote too. It often has slight maroon edging on the leaves, hard to tell from the photo. Then again, there are a lot of Kalanchoe varieties out there...

Your plant looks nice and healthy @madpenguin

 

It is definitely not Kalanchoe tomentosa! (I already have that)
It has smooth leaves with a 'floury' coating.
Kalanchoe / Cotyledon / Adromischus?

So many succulents look similar.
Added a couple more photos.

 

The 'leaves' look rather fat/chunky. An intergeneric hybrid (possibly involving Pachystachys) of some sort?

 

It's a cultivar of Cotyledon orbiculata