I presume Tony is not where can check his information out so you can contact him directly and his email address is under our MI's over to the left under a number of churchyards/cemeteries that he gallantly tried to photograph for us.
I am the Abbey Lane volunteer but have found time this morning to go and check city road for you. There does not seem to be a headstone for this plot unless it was one placed in the ground and in now covered by overgrown weeds etc.
As I said there could be one as a lot of stones in that area are laid in the ground it is just that your plot was heavily laden with soil and weeds. Lets hope Tony is ok.