That's exactly what I was wondering, JB. I know the silver didn't last that long but wasn't sure when the green started. So after the intro silver livery, it was light green, lined or not, from '59 onwards and then A42 in dark green lined only repainted in '63 until late 60s somewhere. I presume it want to a Black or B'n'T livery after that before the introduction of supertrain livery after c 1972.
The only point of confusion in my mind is Glover's (your) quote regarding A10, 11,15,24,25,34,45,51,54,57,59 &60 being dark green with waistband by late 1959, one loco us in light green (A46). Typo with A10, 11,15,24,25,34,45,51,54,57,59 &60 being the first into light green by late 1959 and A46 remaining in silver until dark green post 1963. Would that be right?