Yeah, A and C, what you say is correct and accurate, but I'm talking about the 318 "variant"... as far as I'm aware, BA were one of, if not the only launch customer for what is an aircraft that can carry less than some of the existing 737 variants they operate on the same routes.
The 321 is the one that is needed to replace the high-density Shuttle routes and the high club-load intra-european stuff previously the remit of the 757. Better late than never...