Well leg 10 had teams checking into the pit stop in Edinburgh on Dec 3, a Monday. Two teams checked in before civil twilight (M/K, B/A) and two teams checked in after civil twilight (C/J, M/B). In the montage below, in the upper left photo, you can see B/A turning the corner off the Royal Mile onto Niddry Street for the run up to the mat. The sky is definitely still very light. The next screen cap, #52 (Ep 10, page 2) leaves out the shot of the sky, but still very light outside. On Dec 3, civil twilight was 4:28 pm.
Teams were next spotted in Belfast on Dec 5th racing in the midday. The episode promo for Leg 11 showed a few shots of a train, so possible that the mode of transportation to Belfast from Edinburgh is the train/ferry to Belfast. ScotRail lists three time for this trip,
Lv Edinburgh Ar Belfast total time
05:55 13:453 7:50hrs
10:00 17:453 7:45hrs
14:30 21:453 7:15hrs
These are just representative examples of travel. There are tons of "a la carte" options with trains and busses to reach the ferry port, but not that many ferries. The surface transportation also gives Phil time to get ahead and film his standups in leisure.
Since the promos, so far, have shown all activites in Belfast to be in daylight, I think that teams were relased (after 10:00am, Dec 4) in time to make the last ferry to Belfast and then have an HoO through the night in Belfast with completion of Leg 11 around midday on Wed, Dec 5.
There is one aspect of the montage that is interesting......does anyone know where B/M are in that photo. Is it at the Edinburgh airport?