Good link here in regards to 'Southern' MK2a/b/c rolling stock ->
http://www.semgonline.com/coach/brmk2_1.html
Interesting snippet "Then in late September 1992 the rakes were further reduced to seven coaches. In these latter of locomotive hauled operation days four later Mk2 s were introduced into these rakes. Mk 2d TSO 5687, Mk 2e 5795 - these had their Intercity markings removed and NSE flashes were applied next to the coach numbers - plus Mk 2d FKs 13575 and 13563 still running in blue and grey livery"
So it seems that NSE (as it was at the time) did have at least one MK2d & e carriage, although I really can't remember seeing any rakes whizz pass my secondary school with "Intercity" liveried stock, all I can remember is Blue Grey mixed with NSE painted stock behind the Class50s...*sniff* them were the days, along with the Class33's pulling REPs / TC's towards the South West before the plastic pigs (442's) were fully in operation.
Lucky for me, my middle school and secondary school both backed onto the same stretch of line (Waterloo - Woking) so in the mid 80's & to the mid 90's if I got bored in lessons I just looked out the window watching the trains, and break time / lunchtime spent standing in goal on the playing fields watching the trains until the ball got near me.
*Cough* That's enough of my life story I think..
Edit: Here's a blurry pic of a Class50 pulling a rake of mixed MK2's past my local station sometime in the mid / late 80's (I think) :
(sorry for OT)