The United Kingdom of Great Britain and Northern Ireland consists of England, Scotland, Wales, and Northern Ireland. The Isle of Man and the Channel Islands are British Crown Dependencies but are not part of the UK.
The diner inside is not as seen in the show, but the sign is still there and there's local history behind it. There are framed newspaper clippings and the menu acknowledges the show's three waitresses: Alice, Vera, Flo and the owner: Mel.
Jennette Michelle Faye McCurdy is an American actress, producer, screenwriter and singer songwriter. In Sam & Cat, she reprises her roles as Melanie and Sam Puckett from iCarly.