The only British person who actually knows how to use spices is Gordon Ramsey, and he gets a pass on not using them cause he actually knows how to cook good food.
He can’t handle spice. His 2 appearances on Hot Ones are their top-watched episodes. They’re also the best. He’s so funny. He had so much fun during his first appearance, he came back for their Holiday episode. It was awesome.
Desensitization based on routine is all there is to "handling spice". It is neither an achievement nor an ability. Anyone can get used to it by starting from small amounts and slowly increasing the spice level. Also, there are many spices, chili is only one of them.
Tbf, I've rarely had a chili that wasn't mild, unless I or a neighbor who likes it hot made it. You may want to avoid certain salsas (red or green) at restaurants and bodegas where actual ethnic Latin Americans eat, if you're not into spicy, though.
I've never watched Ramsey, and I'm not British, but a hint of cinnamon in ground meats is great. Cinnamon in savory foods is underrated in general, imo