ScotRail operations 1980s-privitisation

I am currently in the process of researching the Mk3 and Mk2 push-pull sets as used by BR ScotRail in the 1980s for a layout idea based somewhere on the Stirling-Perth section of the Scottish Central railway. While I have been able to find the formations for the push-pull sets, I have been unable to answer some questions about the actual, physical operation of the push-pull sets. I apologise if firstly this topic is under the wrong category, there are quite a few and prototype questions seemed t

There is one additional point which may be of help. If you ever buy the 1988 Platform 5 Combined Volume (and possibly the 1988 Platform 5 Coaching Stock Pocket book as well) all of the Craigentinny Mk2D TSO stock is marked as being in ScotRail whether it is allocated to Provincial (PXXX) or Inter City East Coast (IECX). This is incorrect. The Provincial stock was in ScotRail: 5623, 5653, 5659, 5662, 5663, 5671, 5673, 5694, 5711, 5716, 5726 and 5740 The East Co