The news is out - scientists at my old university, (Leeds University in West Yorkshire) have discovered the PERFECT way to make a "Bacon Butty", that quintessential British sandwich, and they have devised a mathematical formula for it!! The bacon butty is one of my FAVOURITE sandwiches of all times.......especially when doused in HP Sauce or Worcestershire Sauce! Here is my method - it's hardly a recipe, more of an idea and an assembly job! I have posted their mathematical formula at the end of the recipe - my formula is: Eat your bacon butty whilst it’s still hot and crispy!! Please increase the quantities as needed. I like to use smoked bacon, but any good quality dry cure bacon will be fine.