I am being asked to take a letter addressed to the Ambassador of the UK, in order for him to confirm that I truly exist and that this is my passport. I have a feeling that if I show up to the embassy with it, they will just look at me and ask me to leave ???? . They of course have a 'validate a copy of passport' service which I can request (I actually thought I already did that, but I have handed over so many documents already I honestly can't remember). Once I get this, and then translate it to Thai, do you think this should be enough? Or do I somehow need to get the embassy to reply directly to the police that issues the letter?