Yesterday I purchased a St Albans to London Thameslink off peak return with Senior railcard discount via the GWR web-site. When I attempted to collect the tickets two and a half hours later none of the machines I tried recognised the code. The man at the booking office tried as well with the same outcome. As a result I had to purchase another ticket from the booking office. Fortunately there was no queue, so I didn't miss the train I was aiming for! Can anyone suggest the best way I can claim back the £9.15 from GWR?