But the OP wrote "I have been purchased a standard ticket GLC-EUS". If this has been purchased by warrant, through a travel agent or a company account, it is likely that a refund (less admin fee) can be made only as a credit to the same account. I think that is often the case for credit/debit card purchases too.
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Curiously, Advance ticket terms and conditions apply only to Advance tickets. They do not apply to flexible tickets route "Any Permitted". So how do you come to the conclusion that
You cannot excess a TOC specific ticket.
Example: You couldn't excess a WSMR Only SOR to a Any Permitted SOR, correct? You can only buy a new ticket and claim a refund on the unused one with an admin fee.
Now, if you hold an Any Permitted SOR, you couldn't excess that to a TOC specific ticket because you would be losing out unless an anomaly meant the TOC Specific ticket was more expensive.
It is ridiculous to allow someone with a more expensive fully flexible ticket to excess into an extremely restrictive ticket (maybe cheaper). You couldn't even excess flexible returns- how could you excess a return into two singles?
e.g allowing it would cause:
I have a Liverpool-London SOS priced @ £122.50
I decide I would like to travel first class, but not at the price of the FOS.
So I want to change my ticket.
There is an Advance 1st ticket available priced @ £57.00.
I ask for an excess, the excess cost is
£0.00 as my original ticket was more expensive.
However, I lose all flexibility and any right to a refund. I essentially pay £122.50 for an Advance 1st ticket. A TOC will not give you the difference in cost back!
Therefore it would be better to get a refund on the original ticket and book an advance fare.
Why would it be a good idea to allow passengers to pay effectively
MORE for an Advance ticket and lose flexibility?
An Advance ticket is "TOC Specific".