There is quite a bit they have here in Scotland I hadn't had or heard of before and am very fond of now. A few of these are available in other parts of the U.K.
Here is a few.
Potatoe (tattie) Scones,
they tend to fry them, but they are nice in the toaster as well, and there is a bakery on the south side of Glasgow that make such nice ones I just eat them as they are. they melt in your mouth. Otherwise I have them with scrambled eggs or with Vegemite on top, I'm probably the only person to have ever eaten that paticular combo.
http://en.wikipedia.org/wiki/Potato_scone
Kippers,
I like these for breakfast as well with Scrambled eggs. I think I prefer the buttered ones you boil in a packet but the ones you get from the deli and grill or fry are great as well. It's a very salty smokey fish.
http://en.wikipedia.org/wiki/Kippers
Pot Noodle,
I love these instant noodles. I lived on them when I first moved to the U.K and was living in a share house that you just couldn't cook in. The Kitchen was a disaster. These come in a lot of flavours, though I find 50% of the flavours are a little bland, the other 50% rock my world. Bombay Bad boy is my faveorite.
http://en.wikipedia.org/wiki/Pot_noodle
Irn Bru,
I wasn't sure about this at first, but know when ever I go for a soft drink it is my first choice. It's a bit similar to creamy soda if anything to give you an idea, ut with more tang. I return the glass bottles to the corner shop for a discount on my next bottle. You wouldn't believe how popular it is here in Scotland.
http://en.wikipedia.org/wiki/Irn_bru