I am going to Thailand for 37days on Wednesday 20th of June (in 3 days!) and I just found out that I need more than the visa you can obtain at the airport as that only covers 30days. Having rung the embassy and being told that I should have applied two weeks previous to this I don't know what to do! Any suggestions...?

I am a British national by the way, as this seems to make a difference as to what I can and cant do!