Keith A said (along with others elsewhere): After 7/7 one address took 14 days to make safe enough to search.

I'd like some elaboration of that, but so far haven't heard it. If they knew the building was unsafe, they presumably knew it had explosives or whatever in there. That's surely an offence in its own right and the people responsible could be arrested and charged immediately. Under the (new) double jeopardy rules, I think, the people involved could be charged with unlawful possession of explosives, etc, and then the charges related to terrorism applied later once the evidence had been gathered. Or is that mistaken?

Have you more details?