@Benjamin *****

may I ask a clarification; are you saying that if you have a non O-A 1 year visa, you can exit and return to Thailand as many times as you want without having had to purchase a multiple re-entry permit?

Could I also just observe that there are certain exceptions where a person with O-A visa does not require health insurance, for example, if the original stay in Thailand was based on a Business visa.

So true, lots of invaluable information.

@Nigel *******

Many fixe term accounts are also instant access, and in this case, are accrptable to immigration.

10th & 11th are holidays surely?

Note that if your non-immO-A visa was IMMEDIATELY preceded by a business visa, health insurance is NOT required.

As well as updated passbook, your bank needs to provide last 2 months statement and a letter confirming balance and status of account. Usually, immigration will accept these dated a few days before your application.