Heads up to anyone planning to try and get two back to back Non B visas in Ho Chi Minh.
You will have to show a flight out of Bangkok when you go to get the second Non B.
This may be a massive problem as your Thai sim card won't work meaning you can't get the SMS from your Thai bank and your visa card won't authorise the purchase of a ticket using the airasia app on your phone.
Clusterf**k