From Newsgroup: uk.railway
It has always been possible to reserve seats on the GWR website for almost
any TOC that offers reservations. You donrCOt need to hold a ticket to make
the reservation (though obviously you do to travel). The GWR website has undergone a revamp and it took me ages to find the correct page again. So
in case this helps others:
Firstly you need to be signed in via the icon at the top right of
www.gwr.com (the green circle)
Then go to
https://www.gwr.com/myaccount/my-trips
There you should see a Make A Reservation button
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