On the BR Fares website, there is an Off-Peak Return from Theale to Lawrence Hill ticket for £20.15, set by GWR with the Q8 restriction code, yet when I attempt to purchase this fare from the GWR Website these are the only tickets available. Given the Q8 code appears to be far less restrictive in terms of the trains that it allows you to take , if I wanted to purchase it which retailer could I get this fare from