It’s mandated by the safety team. If they don’t say it, they will get pulled up. The amount of secret shoppers going about now, announcements is one of the questions they are asked to assess on, along with audits from management, very frequently they will be pulled up if not saying everything that’s been mandated in announcements.
Believe it or not, it’s got better as a few years ago the company were saying it’s mandatory for a shop announcement to be made departing every stop and this instruction had came from the DFT. Try making announcements at every stop via the midlands. People don’t want to hear it and staff don’t have the time either. The point has been made that announcements playing all the time, will cause people to drown out the important ones.
There’s some staff that take things too literally and will add extra bits on. However the hot bag announcement and the one about doors closing when walking through the train, is mandatory to be made and was mandated by the safety team, who in recent years, seem to be finding issues everywhere that were never a problem for many years (in some cases decades) before, not just what’s being heard in announcements.