Platforms
Total Baloney! Platform allocations are easily available to the general public from the likes of RealTimeTrains.co.uk (*) and have been for several years - RTT even flags up changes from the standard plan. Used to be very useful at major stations like London Euston where announcements were made only a few minutes before departure - if you were in the know you could be at the front of the queue at the barrier (or, in fact, sometimes able to wander straight on to the platform as the gates were open from a previous arrival!).
(*) other similar services are available.