@Jo *********
I have been to all 3 branches of Bankok, all 3 branches of Kasikorn a and 2 of Siam banks in my city, NONE will open an account on an OA visa without me going to the UK embassy in Bangkok for a letter of guarantee. Thousands of people have in the past without a visa, I am aware, people still do now at random branches in random cities. Most people now use agents as its the easiest method!