Cannot comment on the article itself, as I haven't read it, but judging from the comments here, I presume it is not up to the usual "high" standard of tabloid reporting.
I can however comment on QinetiQ's security, since I have operated out of BD and Farnborough. It would not be appropiate for me to comment on a public forum about QinetiQ's specific procedures, but I would say that if they spent less time harrassing the staff on base with radar guns and speed traps, or taking ages to renew clearances, and a bit more time dealing with the casual visitors, they might not have let this particular reporter through.