You’ve heard/read about the Kew Gardens, or Royal Botanical Gardens.
Well, believe it or not, they grow chile peppers too, from all over the world. They had a chile plant from Mexico in 1857, and from Cuba in 1821. Lots of information, including the name of the person who first collected the specimen plants for the Gardens.
Take a look at just the first page of photos etc. here:
Enjoy – and, as they say, pip pip!