Peppers of the World

BBC Gardening charts it slightly differently, calling the old habanero much mightier than NGM’s list, and putting the Dorset Naga, the UK’s entry into the race, up at more than 1.5 million SHUs (Scoville Heat Unuts) (pepper spray is two to five million SHU, pure capsaicin is over 15 million):

Dorset Naga, 1598227 SHU
Caribbean Red Hot, 530283 SHU
Orange Habanero, 487672 SHU
Fiesta (grown outdoors), 286185 SHU
Scotch Bonnet, 265054 SHU
Apache, 103282 SHU
Fiesta (grown indoors), 102328 SHU
Paper Lantern, 85486 SHU
Adorno, 67726 SHU
Etna, 65937 SHU