Hi ast, At the moment I am using some thai chillies about half inch in length. They are quite fiery - I'm just using them up as I have been experimenting with Thai dishes. Usually I use scotch bonnet or dorset nega. The last lot of dorset negas nearly blew my oh's head off, which is something I have never achieved before with regard to heat. He has always eaten them blow your head off phals and I usually like vindaloo/phal, so I think its fair to say that the dorset nega is the hottest i have ever used. CQ