The Brown Government is simply not trusted to give an honest assessment of what is happening on the ground or give the military what it needs. The Defence Secretary is an unknown entity outside of Westminster (and even inside), and can hardly be expected to succesfully champion something as contentious as the war. The best the government can hope for is to survive the coming weeks and hope the British public focuses on their summer holidays. But this is a reactive strategy, one that will leave it exposed when the Taliban achieve their next Viet Cong-style success.
Let them conduct hearings, travel to both Afghanistan and Pakistan and report back when Parliament returns after summer recesses so they may take into account the Afghan presidential elections planned for 20th August. If the government wants to be on the front-foot, this may be the only option. The alternative: to fight a rearguard action. And as any military officers would tell you, that is rarely a winning strategy.