FYI and to be prepared.
The London Thai Embassy looks to of been updated again regarding applications for Single entry Tourist visas.
Now requires a confirmed flight to Thailand and financial information.
Required Documents (from 15 June 2019)
For Single Entry (stay up to 60 days)
A current passport with validity not less than 6 months and at least 2 blank pages Printout of visa application form submitted online, with bar code Confirmed air ticket to Thailand Proof of accommodation in Thailand e.g. hotel booking, invitation letter from family or friend in Thailand.Proof of financial support e.g. bank statements, proof of earnings, sponsorship letter Proof of residence in the UK or Ireland (if applicants are not nationals of these countries) e.g. long stay visa, residence permit, BRP card