I'm not a driver but surely if the driver is aware the formation is different than booked, some sort of policy would apply to:
- inform the signaller, just to be sure;
- approach the entrance signal slowly if the platform lengths make this a possibility?
If the formation changed, or was an VSTP maybe. As far as the driver and SC were aware, it was a booked 10 car 730 set - almost identical in length to a 12 car 350 set.
They wouldn't normally be contacting the signaller to advise/confirm they have a long train which doesn't fit in all platforms. The formation was inputted incorrectly by LNR I believe.
Driver will face questions on why they took the signal to a platform it wouldn't fit on, as will whoever inputted the formation onto the system as this wasn't a simple case of signaller error.
Haven't heard anything about the speed through the approach, but at 40/45 I think, it's not a high speed approach and you can easily see the platform number in the theatre box from a decent enough distance to stop the train. I often have my head out of the middle can window to see which platform I'm coming into.