The ntuples files can be found on the grid. They are stored on the SE of the Durham node. To access them, one needs access to the logical file catalog (lfc) that the 'pheno' VO uses. To do so do

{{{#!sh
  export LFC_HOST=lfc.grid.sara.nl
}}}

with this one should be able to list the ntuples file for a given process, say Wm1j at 7TeV

{{{#!sh
  lfc-ls /grid/pheno/BlackHatSherpaNtuples/7TeV/Wm1j/
}}}