>>50059681technically we(as in US English speakers) have 27 letters. I have absolutely no idea if this was ever widespread outside of USA specifically with respect to British English speakers.
"and" used to be a letter. It's where the word "ampersand" came from - it's a corruption of the phrase "and per se."
So you'd say your abc's like A per se BC... I per se...XYZ And per se.
This isn't like wynn, thorn, ash, eth, etc because those were never part of modern English. & can be found in modern English alphabet listings all the way up to the 20th century and there's still debate over it.
t. useless knowledge, Apple Pie ABC nursery rhyme, and
http://docsouth.unc.edu/imls/moore/moore.html#moore5 
