A colleague used that service for her son's passport - the postmaster checked the form and signed it - then decided that he wasn't happy with the photo - her son is about 14 months old and the youngest of 4, so understandably it then took them a few days to reorganise the photo and go back in by which time he was on holiday and no-one else had authority to do the check and send. Also he had already signed the form so they had to start again. I ended up countersigning and getting it sent off.