Final answer:
Fish and chips is the most popular street food in the United Kingdom. It originated during the Industrial Revolution and became a symbol of the changes in food during that time.
Step-by-step explanation:
The most popular street food in the United Kingdom is fish and chips. The dish originated during the Industrial Revolution and became a symbol of the changes in food brought on by that era. The more desirable parts of fish were sold at higher prices to the upper and middle classes, while the less desirable parts were fried with chunks of potato and wrapped in cheap newspaper, creating the first greasy and inexpensive fast food.