I have various sets of photographs of the MoD wagons.
Ramp wagons http://paulbartlett.zenfolio.com/modaramp
Warflat http://paulbartlett.zenfolio.com/modawarflatpfb http://PaulBartlett.zenfolio.com/brwarflatwc http://paulbartlett.zenfolio.com/ww1warflat
Warwell http://PaulBartlett.zenfolio.com/warwell http://paulbartlett.zenfolio.com/warwellbogiebolster
Brake vans http://paulbartlett.zenfolio.com/modbrake
WW2 US open http://paulbartlett.zenfolio.com/usaarmyopen
MODA vans from 1959 http://paulbartlett.zenfolio.com/modavan
There are various other collections taken at MoD sites, internal users etc.
Enjoy
Paul Bartlett