Interesting. I've just looked up E. Lathris. Most sources says it grows to approx 1 metre. This little plant is only about 1 foot high!!
Many thanks nutcutlet and fidgetbones, I just found it growing in my front garden. It must have seeded down somehow. Its elegant and I hope its not a thug like some Euphorbia.
I think this must be a Euphorbia. Can anyone confirm which one??