Throughout this time the doors on the train were open and with the 1844 to Southampton due that normally runs from platform 2 a number of passengers were getting on thinking incorrectly that it was their train.
The 1844 duly pitched up and was diverted into platform 1 and after rounding up the passengers it left a few minutes late. A delayed South Wales train arrived and the missing driver turned up and started up the unit. Only then were the train doors closed and the unit made inaccessible to the travelling public!
Ah ... does that explain this video?
http://www.youtube.com/watch?v=gG8tfb-eSuo