Okay: brown sauce is an abomination used by northerners to torment the colourblind.
In both Nottingham and Birmingham, the ketchup bottle can generally be relied on to contain ketchup. It starts getting a bit iffy once you get to Manchester.
Sorry, I CAN'T let this one go.
Depending on your belief system, the Deity of your choice created Porcine creatures in order that they could give Bacon to mankind. The Deity of your choice offered up this creation to compliment their earlier creation of HP Sauce. The Deity of your choice realised that bacon and HP Sauce slapped between two opposing slices of bread (roll, sandwich, baguette- it matters not) were the pinnacle of gastronomy.
Other Porcine products are a happy bonus.
Here endeth the lesson.
If your belief system is such that a Deity does not exist, common sense and evolutionary experience indicates that bacon and HP Sauce slapped between two opposing slices of bread (roll, sandwich, baguette- it matters not) were the pinnacle of gastronomy.
Ketchup is for sausages in bread (or fish and chips).