As Tim said, WftW 2 has become the defacto source for wireless set info. It's not cheap but worth it.
As to quickly telling a MK II from a MK III just look at the row of toggle switches bottom front. Two switches is a MK II and three switches is a MK III.
For WW2 vehicles check and make sure there is a black thumbwheel beside the left hand handle. Many sets were modded by REME post war and had bits removed so wouldn't be period correct.
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