Just to add to the debate,
I'm looking back through my "ECW 1965-1987" book and, if I've understood the appendix properly, it states that there were 2858 VR chassis receiving ECW bodywork including the 30 Coach bodied examples for Standerwick.
Whilst the thread was started to discuss the NBC examples, for completeness, there were also the following companies that bought the ECW body on the VR:
SELNEC
A Mayne
Stevensons
H&C
Burnley & Pendle
UKEA
Lincoln
Great Yarmouth
1 export bus for Leyland Nederland BV
SBG
Depot of the Environment
Cardiff
A an FYI, The very low height version (13ft 5in) were also delivered new to Alder Valley, Oxford, Yorkshire Traction, Maidstone & District, Southern Vectis, Cumberland, National Welsh and Oxford if none of those have yet to be mentioned..