I don’t know that they’d need to be, though. British-style baked beans come in tomato sauce. I just checked my tins, and they’re 36% tomato according to the ingredients list. Unfortunately they’re not that cheap anymore. We pay over CDN$2+tax per tin these days if you buy the multipack. A far cry from the CDN$1.50 all-in those Tesco beans would be.

Interesting, it's something I heard from a co-worker who grew up in the UK. So perhaps its some sort of urban legend there. Thanks for the check!