There's an interesting/worrying article in
The Register that suggests that the whole idea of a 'binary liquid explosive' (particularly one based on TATP) is just a movie-plot device and could never work in practice.
I ran this past a relative who has a PhD in chemstry and he confirms:
That's a very well written article, I like it. We used to mix peroxide and sulfuric acid in the lab. It was called Pirhana solution because it ate everything but excellent for cleaning. If things were really tough I would add some acetone - which was mildly fun - lots of foam and froth.
Meanwhile I've got hundreds of plods down the road from me searching the woods for something or other. Who is kidding whom?