Cafe with built-on gravestones

Hmm. The little tea-shop adjacent to Lichfield Cathedral is very pleasant in many ways... but the wall in its car-park is (oddly) lined with grave-stones...
As you can see in this photo, whoever made the arrangement even decided that there wasn't enough room on the left end for one more gravestone, so s/he seems to have sliced the last one down the middle, thus making only a half of it left!
Very strange.  But no-one in the cafe seemed to know what it was all about.  (Maybe the car-park is built over a small graveyard).