There are actually three things required.
One is the year transaction detail report (this is every transaction for the previous year) this can be up to a week old **
Another is the bank letter (that's the 5 line letter that states your name, the account number and the balance the date they wrote the letter) this can be up to a week old
The last one is the updated bank book and copies of the pages, this has to be done the date you apply for the extension
** keep in mind depending on the bank this year transaction report sometimes has to be ordered 5-7 days before you need it so check with your bank
@Stuart ********
, did I get the timing of these requirements right for Phuket?