Hmmm. So far, the performance of these has been woeful when it matters (i.e. not at 2pm on a Wednesday) to customers who depend on them operating as advertised.
The 1725 BRI-PAD has run 13 times since the timetable change and has been on time as many times as it has been cancelled, i.e. once. Of 13 journeys, 7 have resulted in delay repay claims. If I understand correctly how it is calculated, the appropriate PPM metric for this service stands at 46% so far...
That's an interesting interpretation of "cancelled". Yes that service only currently has 36% of journeys within PPM, but 93% of the trains run (with one cancellation due to the overhead wire damage). It does seem a bad runner so interesting what forms the inward at Temple Meads and its booked turnaround.
As you've said though it seems most of the issues in the last month have been infrastructure related for delays out of Paddington.
https://www.ontimetrains.co.uk/journeys/BRI/PAD/17:25/18:45/GW;dayOfWeekRange=Weekdays;dateRange=12W
Edit: misread you did say only 1 cancellation.