sorry Paul, I can't but hopefully someone can as I'd like to know as well!

I think its Crassula pyramidalis? I'll have to check up to be sure though...

I'm close, its Crassula coccinea.

its a strange one ! thanks Fractal, it doesn't look hardy here

Wow - thanks for the fast response. There were quite a few in the borders at Packwood House (near Warwick) of various sizes/ages so maybe that suggests that it may be hardy - though it was quite a well sheltered area

South African so unlikely to be hardy. I only know of one or two that are hardy enough to be grown outside here such as C. sarcocaulis and that hates winter wet.

Just found this about it:

"Does best in a warm, dry spot in a rock garden with perfect drainage. Prune back stems to just above the base in late winter."