I noticed at Tottenham Court Road station this afternoon that the service
status board at the top of the escalators had printed stickers saying
"Service running well" instead of "Good service". I think it's a slightly
more acceptable phrase, giving the impression that the trains are running
more or less to timetable, without claiming that the timetable offers a
"good" service.

Other station boards that I saw today, and the painfully loud and
over-frequent announcements at Gloucester Road (District/Circle) about
which I complained, continued to use "Good service".
--
Richard J.
(to e-mail me, swap uk and yon in address)