How can I prove my exit from Thailand if I went through E-gates and received no stamp?

@Si**

Unfortunately, i don't know how quickly it takes to process a Subject Access Request (SAR) with the UK Border Force (within the UK Home Office), but make a Request for your own "Entry and Exit Travel History to and from the UK over the past 5 years", specifically, make a request for your Latest Entry into the UK

One can also request Entry and Exit History with Thai Immigration, but it is a paper form and manually would be submitted in person to Thai Immigration (in Thailand)

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@Si**

they want proof that you’re actually in the UK. When i applied from Vietnam they had me send 5 selfies where i was holding my passport and a paper showing the current date, in front of various Vietnam landmarks. Try doing the same and appending any other documentation you have into a SINGLE PDF and upload to their website (it only allows one file per section)

@Si**

Try sending the email to the Local Embassy, the Thai Business and Also the other Visa office in Thailand with reference to your application, I did that

@Si**

Sorry to hear of your situation

E Gate will have a record of your passport number time and date when you passed through the gate along with the gate location and number

(Unless the system was down?)

Good luck