Hi Mark
Re: request for burial details.
As he did not die in Northumberland - we cannot help on this board
You have a request on the Australian board so I am sure if the info is available - somebody will help you
Re: possible marriage. As already explained in my earlier replies, you would need either an obit notice or copy of the death cert in the hope it mentions a wife's name.
If you are able to establish whether he had any children - you could check freebmd to see if any details match. Birth registrations from the September qtr 1911 include mother maiden name