Prevention and Suppression of Terrorism

Perhaps we can dispose of one of the arguments that I have heard adduced by people outside the House in support of an extension to the 28 days. It is argued that if a suicide bomber survives an attempted bombing but is injured, and so is not available for questioning, the extension would be necessary. Is it not the case that if we introduced post-charge questioning, those circumstances could not possibly apply, because someone who was injured while planting a bomb clearly has a prima facie charge against them?