I'm trying to book from Paddington to Torquay early evening on Sunday. Due to engineering works there is a reduced service with trains running via Bristol. GWR's website will allow me to book the 17.33 changing at Bristol (to Cross Country) and Newton Abbott but I can find no way of booking on the 17.27, which arrives at Torquay at the same time but just with a change at Newton Abbott. I'd prefer to catch this train but as Sunday eveing is busy want a seat reservation, however assume it isn't offered as departure is 6 minutes earlier for the same arrival time. One of the many problems with inflexible online booking. Can anyone suggest how I can book on the 17.27? Thanks.