Thanks Tim, the plant looks attractive on sempervivivum-list.de
I searched on the whole name, so didn't find it due to the spelling difference, if I had searched just on "Mark" it comes as one of the options, lesson learned.

Sempervivum 'Mark Weller' it is.
Here's the link:
http://www.sempervivum-liste.d...
Züchter: Mark Weller ( GB )
Translation for Züchter is breeder. GB probably refers to Great Britain.