People keep saying it is all too scripted, and they should adhoc more, however they never used to adhoc on Top Gear so why should Grand Tour be any different?
Top Gear on the BBC was massively scripted.
Having been lucky enough to go to almost 75% of all the shows over the last 4 years of the show, it was very hit and miss, but some weeks they might manage to get through a show without hiccup, but most weeks they would have dozens and dozens of retakes of studio segments as they forgot their scripts or went off script too much for the producers happiness.