Denzil - who says that they'd be the ex-BA 767-300ERs? Why not new-build KC767s straight from Wichita?
There does seem to be a problem with the DPA link. As ever, nothing with DPA seems to be straightforward, so for FSTA try
http://www.mod.uk/dpa/projects/fsta.htm and for A400M, try
http://www.mod.uk/dpa/projects/a400m.htm