I am only distantly related to the Atfields, so I don't have much more info I'm afraid.
I'll try and attach a copy of the 1939 Electoral Register which confirms that the Atfields lived at number 6 and the Jeffreys at number 7.
I've taken a while to reply as it is several years since the original post and I wanted to get reacquainted with the story and also to confirm my connection to Arthur Atfield.
I've been in contact with someone who knows more about this than I do and he (John Wells) is happy for me to quote from a short article that he wrote:
"The (death) certificate for Arthur, who died on 16th March 1945, stated that he was an electrician. This seemed a bit of unlikely career shift, but it was war time, and perhaps the country needed electricians much more than it needed postmen. The other fact to emerge from the certificate was his cause of death which was given as 'Due to war operations'. This came as an even bigger surprise. The war in Europe was about six weeks away from its end. The allied armies had already crossed the Rhine into Germany. What 'war operations' were likely to be responsible for the deaths of civilians in Dartford? The obvious conclusion seemed to be a V2 rocket. More research was needed.
The internet has a lot of references to V2 strikes, but nothing I could directly link to the date of Arthur's death, and his home address of 6 Morland Avenue, Dartford where he died. I also discovered that the Commonwealth War Graves Commission website,
http://www.cwgc.org on its Debt Of Honour page has a section for civilian casualties. Looking at this, I could see our Arthur there, together with 3 other residents of Morland Avenue who died on the same day."
Hope that helps a bit.
Alan
(OK, the file size is too large to post, so you'll have to take my word for it that both the Atfields and Jeffreys were living in Morland Avenue in 1939, before the outbreak of war - so presumably they spent the whole period of WWII at those addresses in Dartford)