There is a small headstone (now laid flat) bearing two sets of initials H.M, & J.M. If this is the one you are looking for I will be happy to sent you a copy of the photo.
Thank you so much, Tony. This is the grave of my husband's gt. grandparents, Hannah and Joseph Marsden.
We are visiting Sheffield next weekend, so we'll try to find the grave. If we have no luck, I'll probably get back to you for a photo!!