Hi, I'd like to renew my UK passport while travelling in Thailand. Is there any way I can do this?

Do you have to be a permanent resident to do this? One of the documents to submit with the renewal application is 'proof of address'. I'm guessing this is a permanent Thai address? I obviously don't have this as I am travelling, but was wondering if this was mandatory or if there was some other acceptable documentation?

Any guidance appreciated.

Thanks