You must be your agent's friend!! I have done my own visa applications since 2007. I submit bank statements, pension advice forms + copies of passport, tabien baan, bank book and now tax return certificate is required.
It comes via Bangkok clearing bank. My pension always arrives in my Kasikorn Bank a couple of day after leaving UK. I set up an e-mail notification that informs the money is in mt local bank
Interesting. I wondered what would happen if I was sick and missed renewing my visa. One of the Immigration Officers I spoke to some years ago said you will have to start again
I use K Bank and they send me a detailed credit advice e-mail that shows the origin (UK) and the destination. I take 12 copies of this with 12 months statement copies. (Kasikorn will print off 6 months free - so twice yearly with a letter of confirmation on the last month). You will need copies of your bank book front and latest pages showing a deposit on the day you attend. I always did this the day before but I have seen people say their local immigration send them back to do it on the day of application). Then the relevant form with picture, passport etc.
I always update at my bank the day before and had no problem at Hua Hin; however, I will check when I d my next 90 days that they are going to strictly apply the rule