Legal challenge to refusal to hold an independent inquiry into 7/7.
Rachel rightly points out just how inadequate the "investigation" by the Intelligence and Security Committee was, a parliamentary group which takes everything it's told by the security services at face value, even when it becomes obvious that they've lied to them on numerous previous occasions. Even when supplied with prima facie evidence of the wrongdoing of those they're meant to be monitoring, the committee likes to shift the goalposts, as showed by their report into extraordinary rendition, which cleared MI5/6 of any involvement in the conspiracy after it decided to change the definition of just what exactly constitutes ER.
The other thing worth mentioning is that the legal challenge, if it goes ahead, will be using the provisions under article 2 of the human rights act which provide for an inquiry into the death of someone if the right to life is ruled to have been breached. It would be nice if the tabloids which have demonised the act now reported that far from being a terrorists' charter, the act also provides the right for those murdered by them to find out whether the state failed to adequately protect those killed. I'm not holding my breath.