Ling Hui, Queen-approved: Products with a royal warrant, in Toronto Sun, 24 gennaio 2013. URL consultato il 1º aprile 2015.
«Heinz Warrant holder since: 1951 When it comes to Britain's two most popular condiments, ketchup and brown sauce, the Queen prefers to order hers from a Pittsburgh-based company. The brand acquired HP Foods, the maker of the legendary HP Sauce, in 2005.»
