I want to thank this group for all the information and prompt response to all answers, I found it very helpful during my application process. Now I want to share my experience in case someone finds it useful.
DTV application (Muay Thai) Approved London embassy.
Application submitted - Monday 13th October
Requested additional document (e-ticket) - Thursday 16th October
E-Ticket submitted (only outbound flight) - Friday 17th October
Visa approved - Today 22nd October
I submitted the following documents:
Last 3 months of bank statements downloaded from the bank app but also got the current balance printed at the bank with a stamp and merged everything into one PDF. (I read in some previous posts that the stamp was requested so I got a stamp just in case).
Driving Licence as proof of current location (Also suggested in some post by successful applicants and by the gym I will be training)
Scanned copy of Passport, Photo and the documents provided by the Gym (I used FitFac Muay Thai Academy in Bangkok - Highly recommended).
TLDR : Answer Summary
A user shares their experience applying for a DTV visa for Muay Thai training at the London embassy, detailing the timeline and required documents. The application was approved relatively quickly, and the user provided tips for future applicants, such as ensuring all required documents are stamped and printed. Commenters congratulated the user and offered additional advice about carrying proof of the visa during travel to Thailand.
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