Sounds like the same plan as last year then. It was thorough but organised and well-managed, and ensured that people didn't take advantage of the busy trains to treat themselves to a free ride.
On the XC HST there was a ticket check in coaches F and E but from that point on the guard couldn't get past the people standing in the vestibules until after Dawlish.
A lady at Dawlish station was discussing the day with another staff member and commented on how the day had gone better than last year and put it down to The Red Arrows display being earlier on in the day.