You have totally misunderstood my point which was....
I asked how many of the planned diagrams (screenshot above) actually were successfully completed. In reply, someone used RTT as evidence that they were all completed. As we know, but I wasn't sure at the time, this is in no way an indication if an HST completed or even started a diagram. Both times I have looked recently, it has shown an HST or timed for as you say. Both times the HST hasn't even been able to start the services in question (Monday last week and yesterday) as they have failed prior to starting the service.
So, what other ways are there to find out if an HST actually completed its diagram?