.. The reason for the lack of information on the westbound platform is
because
trains are constantly entering service at Arnos Grove where there is a
depot. In addition to this there are sidings at Wood Green where trains
are often reversed from eastbound to westbound. The information for the
indicator boards is picked up from signals sent by the track and
therefore with trains entering from different areas it is not possible
for the boards to show any more than the next train. This is also the
case at Bounds Green and Wood Green. Until the technology is upgraded
this will always be the case."

Surely the Central and Northern Line's "CORRECTION" message is
designed to cope with this?