[richrichardsson]

British rarely refer to ketchup as ketchup, we almost exclusively refer to it as "tomato sauce".

[pm215]

I'm British, and I refer to ketchup as ketchup. This may be regional; I'm southern-English. I'd probably by default assume that if you said 'tomato sauce' you meant a generic tomato-based sauce, not the specific condiment Heinz &c make.

[jfk13]

Also southern English, and this matches my understanding of the terminology. But yes, I believe usage does vary regionally.

[_sid]

I'm British and I've only ever experienced people calling it ketchup

[robotresearcher]

I’m British, from the South East, and it was tomato sauce in my family when I was a kid, but now it is ketchup. There was a transition at some point fairly recently. English evolves easily.

[richrichardsson]

I think you've nailed it. I'm was Essex/Kent born and raised, with East End of London heritage. It was always "tomato sauce", was very rare to hear it referred to as "ketchup".

[abrugsch]

or even worse, "Red Sauce"

[richrichardsson]

Yeah, you hear that a lot in "greasy spoon" establishments, perhaps because there isn't enough tomato in the recipe to claim it as such?