Here's my thinking:
Arrive at airport > travel to city centre to get clue to go to Gosford House
Road block at Gosford House > travel to Craigmillar Castle for next clue
Speed bump at gate > bowling at Sheep Heid Inn > Pick up next clue at Craigmillar Castle
Detour and U-turn at Sheep Heid Inn > Pit-stop Dr Neil's Garden - Interviews in Duddingston Kirk
We know the road block is the piping task, we know the detour/speed bump is at the sheep heid inn, we don't really know where they get the cars from, but considering they are building a tramway from the airport right into the city centre it would be madness to get them to drive into the city for a clue (I've been living here for almost a year now and have to drive all over the city and it's a mess anywhere near the tramway route) and in cap 52 of the first promo the roller girls are running through a car park that has distinctive yellow no parking cones in the background and the hockey boys are running down the Royal Mile, which I think they are running towards the cars, in pics 17-19 and 30-31 it looks to be interviews given after the pitstop in a stone building, the only place that it could be, unless they drive somewhere else is the Kirk.