I'm sure you've all read the news about Cornish Pasties receiving protected status. Only those prepared in Cornwall and have the design that look like the kind of shoes I imagine Theo wore on his wedding day are allowed to be called Cornish Pasties.
Other notable UK foods with protected status:
Scotch Lamb & Beef
Melton Mowbray Pork Pies
Dorset Blue Cheese
There are hundreds of protected foods in Italy, Spain and France.