Ketchup on pizza is a no go. Crushed red peppers is preferred. I was under the impression that your English Mustard reigned supreme along with the vinegarI do, and last indulged that fetish last night with burgers, salad, chips and mayo. Although I probably got it from living in Lesser Germania for five years.
Almost ubiquitous is smothering chips (and virtually everything else) with tomato ketchup. We have raised an entire generation of tastebud deficient halfwits who put ketchup on everything. I was having a pizza with my daughters once and they pointed out some knob putting ketchup on a pizza. WTF?
Is Worcestershire sauce still pretty popular?
But that does make me wonder if you folks have a more developed sweet tooth your way. As your chocolate is also way sweeter then the standard here.