What documents do I need to renew my UK passport in Bangkok if I don't have proof of address?

The original poster is seeking advice on renewing their UK passport while living in Thailand, specifically regarding the requirement for proof of address. They mention that their UK passport is due for renewal in January 2018 and their extension is valid until July 2017. The Thai immigration office indicated they would extend their visa to match the passport expiration date, but they face challenges in providing the necessary proof of address for the UK passport renewal. Various comments suggest alternatives like using a rental agreement, bank statements from the UK, or letters from employers or local authorities. There is also mention of the difficulty of dealing with the British Embassy processes as opposed to other countries.