I didn't say it is the ideal situation. Considering London Undergrounds training does not cover national rail tickets, as a member of gateline staff, I see it logical to advise the customer to purchase a new ticket, and when the original is found to be valid, a refund and apology issued.
It is not the ideal situation, and it is an inconvenience to the customer - however it is something that should be dealt with by LU as a company, with regards to training. As a member of staff on the gateline, who has no impact on training and whose suggestions are not listened too, I feel comfortable in rejecting a ticket and advising that the customer contacts the CSC to confirm the vadility and issue a refund.
3 facts:
1). Part of my job description is to "protect revenue on the gateline"
2). I do not personally feel I recieve adequate training on non-LUL issued tickets
3). There is no place we can go to check a vadility whilst on the gateline.
Considering those 3 things I believe I would have acted in the same manner. I do not feel it is the best for the customer. But with the situation you find yourself in when working on the barrier, this is how it has to be.