Sam: The second, B, Jax Ripley worked for the BBC didn't she.
Pascoe: C for Cyril.
Dalziel: I hope you're wrong Peter 'cause if you're not, the next victim's name begins with a D.
How did Dalziel assume that the next victim's name would begin with a D. Yes it follows alphabetically but with A and B they were not names but AA man and BBC. C could have stood for Councillor. So the D could also have stood for anything, not just names.