A couple of related points here.
Namely, when were the last uses of various liveries from the BR years?
I do remember many liveries lasted well beyond their "official" replacement.
For example older units (EPBs, HAPs) were still using BR Blue as late as 1983, possibly into 1984, well after blue and grey was introduced (late 60s, I think).
Blue and grey lasted some way into NSE years, probably into the early 90s, I think I last saw it around 1990.
NSE lasted well into privatisation, still used on SWT (minus the "Network SouthEast" branding) around 1997, but not sure exactly how late?
Not sure about BR green, as that's before my time
Also a related point: what were the newest BR units to be blue and grey when new?
I clearly remember 455s being blue and grey (which they would be, as they pre-date NSE by about three years) and their contemporaries such as 317s would have been the same, but what about say 150s? Or were they "Provincial Sector" or metro liveries from new? Anything newer than that?
Namely, when were the last uses of various liveries from the BR years?
I do remember many liveries lasted well beyond their "official" replacement.
For example older units (EPBs, HAPs) were still using BR Blue as late as 1983, possibly into 1984, well after blue and grey was introduced (late 60s, I think).
Blue and grey lasted some way into NSE years, probably into the early 90s, I think I last saw it around 1990.
NSE lasted well into privatisation, still used on SWT (minus the "Network SouthEast" branding) around 1997, but not sure exactly how late?
Not sure about BR green, as that's before my time

Also a related point: what were the newest BR units to be blue and grey when new?
I clearly remember 455s being blue and grey (which they would be, as they pre-date NSE by about three years) and their contemporaries such as 317s would have been the same, but what about say 150s? Or were they "Provincial Sector" or metro liveries from new? Anything newer than that?