I was looking at dates to fly to Thailand in August. The Thai airways usually shows both business and first class availability. However in August it only showed Business.
Checking the timetable and tracking back the A380 is recorded as flying TG911 up to 30 July.
The next week it states “equipment varies”
Then from 6 August 2018 it records TG911 being flown by a Boeing 777-300
So it appears that Thai are reducing the seats available from London to Bangkok and removing first class.
So much for my upgrade!