My late mother-in-law, Suzanne Wilson, always made these at christmas time. She said the name is because “it’s what you serve when the Bishop comes to tea.” She wasn’t British, but, like me, was an Anglophile, and a great cook.
Excellent toasted, if they get stale, but mine never lasts that long. My husband and I can easily polish off 1 loaf in an evening. Great with a hot cup of tea or coffee, or even a glass of milk!
If you don’t want to use marashino cherries, you can substitute dried cranberries or cherries.