Bristol 13525 -5% (first decrease on BRS for a while IIRC)
I would expect this to continue with fewer flights on the route this winter, and next summer at the moment. In addition, the timings this winter make day trips impossible except for Mondays and even here it would be a constricted day.
Thursday, Friday and Sunday do have two rotations per day but they are afternoon/evening flights. Tuesday, Wednesday and Saturday are just single rotations.
It wasn't so many years ago that there were four rotations on weekdays. There is an hourly direct rail service but it might be thought that the five hour journey time would make air the better option.