Still seems like they're missing the obvious one - the C (what got called the J21 after the London branch was added to the system). Long-lived, ubiquitous - and essential for pretty well any branch line on the old NER. Add the G5 (I'll reluctantly accept that these are probably of more interest to those who model the Boring Black Period of Decline and Decay [1] than the much more interesting and handsome BTP - OK, G6 in the BBPoDaD) and an M or R (D20 or D17 in the BBBPoDaD) and there's pretty well everything needed. Though I fear if Bachmann did it then they'd insist on making them available in black - only :-(
[1] Roughly 1928-1968. Not to be confused with the Boring Blue Period of Decline and Decay (roughly, 1968-1988).