I've been told that the tour will go directly into Edinburgh, with the Deltic on the front from York, not via Millerhill as i first suspected. It will then go through Haymarket and via the suburban line to the south of Edinburgh to head towards Tweedbank. The same 67 that detached at York will be on the rear as i've been told it will be running round after detaching. The 67 then hauls it back to Edinburgh where it has a 2 hour break. The Deltic then leaves Edinburgh and goes back via Millerhill and then onwards back to York where the 67 runs round from the rear and proceeds back to Derby.
The reason i know this i asked Peter Watts about the routing and also emailed them concerning the class 67. This might change as everyone knows what NR are like when it comes to railtours and routing.