Hi DrJack, I live in Kalasin and used an agent twice in the past, most recently in November 2024. All you have to do is sign the passport application form and a power of attorney form for the application being done on your behalf. Send old passport and proof of address(I used my pink ID card). The agent took care of any translations and printing / photocopying required and they used their company credit card to pay. 12,000 Baht all in for a 50 page UK passport. Cheaper than doing it in person as it requires 2 trips to Bangkok.