Sempervivum Flowers

I just acquired this large old clump of Sempervivum today. The plant needs a bit of tidying up but I took the opportunity to photograph the flowers that were on it. I'm not sure what species or cultivar this may be. If anyone out there does know then please tell me.

Here's the rest of the plant. As mentioned, it's quite an old and established clump but needs a tidy up.