And something, I think it was called a Farmer's lunch? Bread, cheese, apple, and CHUTNEY! Oh yes, chutney is defininteely British.
It is called a ploughman's lunch.

Burberry Clothing- the plaid is very British!

The London underground- The only way to travel in London

Buckingham Palace-where the queen lives

Rock music- for reasons already listed

The way they call lunch dinner, and supper tea-time. Oh and they call brunch elevensies!

Bisto Gravy-they serve it on everything

The classic double decker buses

The bear skin hats the guards where at Buckingham palace

Soccer games- the British are football mad (you could also say hooligans are VERY British, but I am going to concentrate on the good things)