The 1939 Register index can be confusing. If shown as Bellamy (Hill), Hill is the name in 1939 and Bellamy is the future surname.
I made an error in my previous post. I should have said he was in Lincolnshire, not Lincoln. The Register only gives the District as North Kesteven. However, on further research, the street names are all in Navenby.
If you enter his location as Navenby when searching, it will find him without any alternatives and includes a map of the village on the transcription page.
David