What supporting documents are required to renew a British passport for a child in Bangkok?

I recently renewed by son’s U.K. passport from the U.K. whilst he was in Thailand. I was asked for a letter from his teacher confirming his address, his identity and that she taught him. I typed a letter myself, giving the address of the school, teachers name & contact number. I sent the letter to my Wife in Thailand via email for her to print and get the teacher to sign before she photographed it and emailed it back to me to print off and forward to the U.K. passport office. They sent the renewal passport directly to the Trendy Building in Bangkok for my wife to collect.

I just showed a copy of his latest report. If you renewing in Bangkok the staff at VFS are very helpful.

I applied for my daughter's renewal a few weeks ago with a letter from the school. On the letter, they used the word "enrolled" rather than attending.