In most of the cities in the United Kingdom, the night is just a little too cold. To keep yourself warm you have to wear nice jackets and hats.
When you sit in a restaurant and the food comes to you, there is a tendency that the food will not be warm as the cold winds of the night just cool the food too soon.
The same happened to some varieties as well.This is when a great person called Al Capone invented the Al Capone pizza.