In 1920 , the Commission built three experimental cemeteries at Le Treport , Forceville and Louvencourt , following the principles outlined in the Kenyon report . Of these , the Forceville Communal Cemetery and Extension was agreed to be the most successful . Having consulted with garden designer Gertrude Jekyll , the architects created a walled cemetery with uniform headstones in a garden setting , augmented by Blomfield 's Cross of Sacrifice and Lutyens ' Stone of Remembrance . After some adjustments , Forceville became the template for the Commission 's building programme . Adjustments were required because all three experimental cemeteries went over budget . To ensure future cemeteries remained within their budget the Commission decided to not build shelters in cemeteries that contained less than 200 graves , to not place a Stone of Remembrance in any cemetery with less than 400 graves , and to limit the height of cemetery walls to 1 metre ( 3 @.@ 3 ft ) .