I have a letter of invitation from the British Council in Beijing. Do I need any further documentation to pick up a 12 months multiple entry visa in Bangkok and how long does it take?

Besides the letter of invitation from the British Council in Beijing, you also need to provide your original passport valid for at least 1 year and with at least 2 blank visa pages, fill in visa application forms V.2011A and V.2011B.

It takes 4 working days for visa processing.