May already have been mentioned, but the Class 40 Railtour has no brake vehicle in the consist. Doubt it will get fixed any time soon but couldn't let it go unreported.
If I had to guess, best case scenario they were copying a real formation but that more than likely used MK2 aircons with something like a BSO in the formation, but this was before those were added to TSW so they just used first and standard class MK2As as the closest they could get. That's the best case scenario mind you, the alternative being it was a genuine oversight considering this was a service added in the post release patch and not in that dreaded first iteration of the timetable.