[Keith]

As you say the fact that it mentioned The Andrew Marr Show and Prime Minister Theresa May might have been the major giveaways, and it was just the timing that Huw appeared directly before they switched back to the studio.

Switching back to the studio does rely on the necessary people being back in the studio and gallery. I imagine that normally during that programme presenters and staff might use it as an opportunity to take a quick comfort break. Getting presenters and sufficient other staff back in might take an extra minute or two.