I have just arrived in BKK on an STV from the UK and the journey was a breeze! Waaay easier than I was expecting it to be so I wanted to let people know exactly what I did in case anyone was thinking of making the trip:
1. Booked my flights with Finnair
1. Insurance is with Staysure and I bought the unlimited coverage with 100 day extended stay
1. Pre-flight PCR was with DAM (midnight guaranteed)
1. SHA+ was via Agoda (the hotel was particularly basic but it was only for one night)
1. Accommodation for three month is booked via booking.com however I have free cancellation so can still be free to explore
1. I submitted the required documentation to the Thai Embassy in London and secured my STV before I applied for the Thai Pass (Important!)
1. Once my visa was approved I applied for the Thai Pass and was approved almost immediately (like 48 hours and it was confirmed)
1. I printed everything off twice so I had one copy in a folder and one as backup in my bag (all of the above) and at every checkpoint I just handed them the whole folder.
Hope this helps someone 👍