This is in the something else category.
I've seen some posts from British pensioners regarding the Certificate of Life sent out by DWP and getting it witnessed.
I recently got mine and took it to the piya baan in our village, she filled it in as witness that I am still alive and kicking, then stamped it for me. Everything she filled in, including her stamp was in Thai, but DWP have just messaged me by SMS that it has been processed and I don't need to take any further action.
I hope this helps others in the same situation.
TLDR : Answer Summary
A British pensioner in Thailand shared their experience of obtaining a Certificate of Life required by the DWP (Department for Work and Pensions). After receiving the certificate, they visited the local 'piya baan' (village head) to have it witnessed. The village head confirmed their identity and stamped the document in Thai. Following this, the DWP processed their application without needing further action from them. Other comments discussed experiences with the certificate, suggesting variations in processing and methods of communication with the DWP.