All good - I now have a copy of the TM30 from my landlord, visited my agent here in Chiang Mai and he will get the receipt from Immigration tomorrow. Then back to Immigration to process the TM8.
thanks Tod - this seems to be the best option for me. Although I already have a Thai bank account I use it for living expenses only. I would prefer to leave my investment savings in my Australian bank account (instructions from my grandchildren)