Send a message to the person who requested a photo of the grave monument of Philip Lovell Phillips with the following comment:
I am researching this person's father-in-law, William Bengo Collyer (see my website www.wbcollyer.org). Once I have seen the image and checked it is the right person, I'll come back to you to ask the originator's permission to use the photo on my website (my website is also non-commercial and free to use). I'm happy to acknowledge copyright if I can use the pic. Many thanks.