Cheers, I'll give it a go D.
I was just looking at this list
Chili Peppers - a list of chili peppers and their heat levels
Now I know why the Thai chilies give more of a kick. Wow, there's some hot ones out there. The missus thinks I'm crazy when I pop the Thai chilies like lollies, and I wouldn't dare go any further up the scale after the occasional knock down by one of them.