Yes but what are they calling the new DLR platforms? There's nothing
logical short of redoing the entire station.

4a and 4b I think.


So why are most Stratford announcements about specific platforms broadcast
to all and sundry?

This is due to crappy announcement system at Stratford station. DLR
has it's own system, which I believe covers only DLR platform +
northern end of platforms 3 and 5. The DLR announcements are
definitely separate from the main announcement system (which leads to
conflicts when station staff talks over the DLR announcements).