I don't think the point made above about Waterloo staff being unfamiliar with slam door stock is necessarily valid, because if they follow the same routine as last time FGW▸ will provide all their own despatch and platform staff.
Correct: FGW will be providing their own despatch and customer service staff.
I'll see if I can find out anything about the eight-minute discrepancy between the
GBTT▸ and
WTT▸ departure times.
In terms of platform lengths, platforms 8 - 16 and 18 are all theoretically capable of accommodating a twelve-car train made up of 20 m vehicles, which means they can also easily take a ten-car 444 (23 m vehicles) and therefore would have no trouble with a 2 + 8
HST▸ formation.