Avanti Standard Premium upgrade issue

[realaledrinker]

I bought two advance standard class singles on the app from Crewe to Euston for Saturday. I upgraded to Standard Premium subsequently using the option within the booking. This has charged me the £50 and the tickets now show that they are Standard Premium. However the seat reservations have not changed and are still showing as the original seats and coach. It would seem I cannot get this sorted at a booking office and the Avanti chat was a waste of time. Any advice other than a just turning up in the hope that there is space up front?

 

[Watershed]

It is highly unlikely that there won't be space in Standard Premium. You may be able to make a SP reservation using the GWR website: create or login to an account, then go to the My Bookings section, click "View bookings" then "Make a seat/bike reservation". Bizarrely, you need to select Standard class, and then hope that the coach it allocates you to is one with SP... Specifying a table may help with that, as there aren't many tables in standard.

You could also try contacting Avanti on Twitter. Sometimes TOCs have been known to issue seat reservations that way.