For an unused Off-Peak Return ticket with Great Western Railway, you are entitled to a refund if you apply within 28 days of the ticket's expiry date [1]. GWR charges an administration fee on refund applications, though the members differ on the exact amount.

If your ticket is completely unused, you will receive the full ticket price minus the administration fee. If you have already used part of your return ticket (for example, the outward journey), you can still claim a refund on the unused portion. In that case, GWR calculates the refund by taking the price you paid for the return ticket, subtracting the cost of the cheapest valid single ticket for the journey you actually completed, and then deducting the administration fee from that difference. Depending on ticket prices, this partial refund could be minimal or even zero after the fee is applied [1].

If your reason for not travelling is that GWR cancelled or significantly delayed your train, you are entitled to a full refund with no administration fee waived [1]. You should submit your refund request through your original point of purchase—whether that was the GWR website, a mobile app, a third-party retailer like Trainline, or a station ticket office [1]. Once processed, GWR will email you confirmation, and the credit typically appears on your card statement within 10 days [1].

For the exact refund amount on your specific ticket, check the terms printed on your booking confirmation or contact GWR directly with your booking reference, as the calculation depends on the ticket price and any portion already used.