I went to immigration for my 90 day report and to check out which accounts are acceptable for the 800000 in the bank and could not get an answer, so useless these people, only told my investment account with Bangkok Bank was not, despite being able to withdraw the money as required, is there a definitive list any where?

A regular savings account.

Anything else will suscitate the same debate "yes / no / it was fine with me / but not in that office / etc" that happens anytime the question is brought.

Ultimately it depends on which office is doing your application but time deposit accounts are perfectly acceptable under the law as long as they allow for instant access (albeit with loss of interest), which all or nearly all do. Jomtien certainly accepts my time deposit without question.

Investment accounts are not acceptable because the value of them can vary from day to day and could be less than the required amount.

Most offices will accept a standard fixed term account that allows for withdrawals with no delay and no penalty other than loss of interest.

Thanks all for the replies, so it looks like a fixed term account then.