Hi Nigel,
Sorry I cannot help with photos, but here's a couple of comments.
I recently visited the same Cemetery looking for my grandfather. I found the staff at Masterton District Council offices extremely helpful and they were able to provide me with an aerial photo with a marker on the spot where he was buried. As there was no headstone, this was very useful to find the exact spot where he was buried.
You can check their website here
http://www.mstn.govt.nz/index.phpAs for the house photo, most of NZ has been photographed by Google, so normally it would be possible for you to visit Google Maps, enter 31 Bentley Street, Masterton, switch to "Street View" and instantly be able to view the house from several angles from your computer.

However, it seems that the portion of Bentley St containing No. 31 has been missed, so for this address it will be necessary for someone to visit it in person.
Hope this is some help.
Cheers
John B