My great grandfather is buried there. But it was in a paupers' grave and has already been 'upcycled'. All I have is the plot number. I don't have a problem with reusing grave sites.
try All Saints, Peckham http://allsaintspeckham.org.uk/community-and-mission-work/community-and-mission-work-we-support/foodcycle/ or Pecan/Southwark foodbank http://www.pecan.org.uk/what-we-do/community-services/southwark-foodbank