Ok, at least not the embassy in London, and normally it’s sufficient with current balance at date regarding funds for a Non O, also for a Non O in country Thailand.
If you apply based on monthly income you’ll need to provide three months bankstatments. If you apply based on funds it’s sufficient with a updated bank statement showing current status.
If you see my handouts from the embassy in Malaysia, they in fact required a health certificate and health insurance also for the initial 90 days Non O visa as one of the few embassies worldwide.