Sometimes trainline is cheaper than other websites, because they do split ticketing by default now. Although I think they are not as good at it as some of the dedicated split ticketing websites.
@Ruserius - you can book bikes on the gwr website (for any service) even if you've book the ticket somewhere else. Just log in, go to the 'Bookings' page and click 'Make a seat/ bike reservation'
Sometimes trainline is cheaper than other websites, because they do split ticketing by default now. Although I think they are not as good at it as some of the dedicated split ticketing websites.
@Ruserius - you can book bikes on the gwr website (for any service) even if you've book the ticket somewhere else. Just log in, go to the 'Bookings' page and click 'Make a seat/ bike reservation'