Next time get the bus (or walk) to Gunnersbury, and get the
District/NLL from there. The NLL has a timetable, so at least you can
plan for that, even though they are sometimes late.

Trains in the morning rush seem to always be 2-3 minutes late and
severe problems are rare; the short constant delays seem to be less of
a problem in the evening rush but more substantial delays (15 mins or
more) are more common. Punctuality does seem to have improved sharply
this year compared to last where it was rare that a train was not 5-7
mins late.

The staff and boards are best ignored, incidentally: the system that
reports the delay digitally appears to have been programmed as part of
a school project and the staff regularly just lie. I speak from many
months' experience. Only 2 weeks ago at Acton Central, the man at the
ticket counter told me that a train had just left Gunnersbury - a
colleague at that station assured me otherwise: the magic of mobile
phones, eh?

Incidentally, on the matter of the GCSE train arrival information
system: I was wondering how National Rail compile punctuality stats? Do
they use the same data that we see on the screens in the stations or do
they capture it separately? I ask as it is very common (as in
more-often-than-not common) that a train delayed by more than 5 mins
will simply be reported as being "On Time" at my station on the screen.