I've managed to have a look at a fiche copy of the burial register for Daventry's parish church, Holy Trinity. Unfortunately, no record found of your John P. WHITE.
I'm reasonably familiar with Daventry, but not sure whether there's anywhere called "The Green". There are plenty of "The Green"'s in surrounding villages so maybe he was laid to rest somewhere else.
I think your best bet now would be to purchase his death certificate, as this will confirm his abode and will also give the name of the informant - hopefully his wife or a child - and this will confirm that you have the right person.
Pennie