But families of the dead victims and an increasing number of 7/7 survivors claim there are inconsistencies and basic mistakes in the official accounts that need explanation.

And they are demanding a full public inquiry to answer key questions about what the Intelligence Services and the police did and did not know before the bombings.

Meanwhile, the Government's determined refusal to meet their demands is having a very dangerous side-effect - fuelling myriad conspiracy theories about 7/7. Books, blogs and several video documentaries point to oddities in the official accounts.