You are correct at one time we did have photos of Grave stones at City Road and unfortunately they are no longer available to us.
We are trying to build up a new list of available MI's for City Road so if you have a photo of the headstone (once you have visited) and would like to donate it to the database we would appreciate it.
If you post the section number and the plot number along with the name you are interested in I could try and get up to City Road and have a look for you. Not sure when that will be though as something called work gets in the way