One uniquely cultural aspect you will find wherever you go is food dialect, that is starkly different from that in other places. Whereas there are standard names for most food, most countries have their unique slang terms for each of them.
Here are some uniquely British food references:
- Bangers
This term is used to refer to sausages, that are combined to form a bangers and mash dish. Most people, however, use the word to refer to just any kind of sausage.
- Afters
This is a popular term among kids, used to refer to dessert. 
It was initially popular in schools, but later became a popular term around all food circles.
- Bossman
This is the guy serving you at the front counter. He is said to bring such joy and satisfaction, that there is no better term of honour to call him by.
- Bevvy
A hip way of saying ‘beverage,’ it is used when diners want a refill of their glass and is usually accompanied by a gesture of holding a glass, and bringing it to the mouth.
- Builders
This refers to milky tea made with two sugars, and a teabag left to sit for a while. The seeming grammatical violation ‘a builders’ is often used.