James, bangers and mash is sausages and mashed potato. That's real sausages, not the weird flat stuff you get in some US restaurants.
I have never heard of swib, or even anything sounding remotely similar.
Haggis is a Scottish dish - LabRat or Loriel could tell you more about it than I can. All I know is that it's spherical in shape, and that the ingredients are sewn up in the lining of a sheep's stomach. What those ingredients are I could not tell you!
Wendy