Hi, I have seen several posts but just want to be sure that I am reading correctly that the GWR that takes you from Bath to London Paddington station is the fastest train. We are not concerned about paying extra for a faster train but can you please advise that the best site is to book through the National Rail site or should I book directly on the GWR site. Again, I am ok with paying extra to book in advance but want to make sure I am choosing the best site (if I run into any issues) vs. a re-sale site.
Also, does anyone know if you can purchase this ticket as open ended? Or is it best just to pick your specific time.
Thank you!