Thank you. I found exactly what I was looking for in that thread.
That "Revolutions Trains" pdf shpuld be treated with a large pinch of salt though.
It shows the Edinburgh portion next to the loco on the Lowlander, which is wrong in both directions (it is detached from, and attached to, the rear of the Glasgow portion)
And it shows the seated accomodation and club car at the rear of both legs of the Highlander (furthest from the loco) despite the reversal at Edinburgh.
Actual formations on RTT this evening
Northbound Highlander 1S25. Seats/Club at leading (country) end of both portions. Two accessible cars in first portion so that will be the Aberdeen/FW one
Northbound Lowlander. 1S26/1c26 Seats/club at London end of each portion
Southbound Highlander Seats/club at rear of each portion (
1B16 Aberdeen/1M16 Inverness) which will be the London end after reversal at Edinburgh.
1B01 formation not shown, but the third accessible sleeper (Fort William) is at the rear of the train as it approaches London, so formed Inverness- Aberdeen - FW
Southbound Lowlander - 1M11 -Seats / club at London end of Glasgow portion, but at front end of Edinburgh portion (
1C11) which became the country end when the trains combined, so arrived at Euston with the two seated portions and club cars at the extreme ends of the train.
It looks like the northbound Highlander is back to front tonight (Monday). This is probably because last night (Sunday night) was unusual as the trains ran via the ECML. This requires a reversal at Wembley, and using the "wrong" end of Waverley. These effects cancel out for the Highlander, but result in both Lowlanders ending up back to front.
A Lowlander that has arrived in Glasgow back to front can be turned round using the Hamilton Circle - the 5S26 ECS ran from Glasgow to Polmadie via Hamilton this morning, so that rake is are now facing the right way. (There is also a path for 5M11 to go from Polmadie to Glasgow the same way in the evening) However, tonight the Edinburgh portion is still reversed. But it's not so easy in London (or indeed Inverness, Aberdeen or Fort William), so that rake will probbaly not be turned the right way round until it next arrives in Glasgow, on Thursday.
EDIT. Any Highlander rake that gets to Edinburgh back to front can be reversed while on diesel power by going round the "Sub" (Edinburgh Suburban line)