After only a brief mention on this thread, I think we need to re-introduce black pud to the butty discussion.

A bacon and black pudding butty with red sauce - bliss. Note: Bacon is best bought from local butchers where it won't be the water-filled plastic the supermarkets pass for bacon. It's often a lot less fatty too. Black pud - once again, locally bought is best, Bury is best of all, especially if you buy it fresh of the market. Bread - white every time from cheapo sliced to doorstops of freshly baked, but barm cakes, muffins and stotties are also very much allowed - especially when combining bacon with egg/sausage or black pudding.

Yum.