If someone's bright (?) enough to be scouring Pprune for hints about terrorism, they're bright enough to take a cheap flight and keep their eyes open and their brain switched on through security. I think it's safe enough to state the blazingly obvious here.
Roughly four or five times the population of the UK goes through UK airports every year. That's quarter of a billion people. Your chances of ending up airside with things you shouldn't have, if you approach the problem with a few smarts, are extremely high (what were the TSA stats for agents trying to get naughtiness through? Detection rate close to nil. What, you can't think how to do it?).
The business of mixing binary bombs at FL330 is bogus. The chances of it working are tiny, and there are so many better ways...
The only reason for the continued liquid restrictions I can think of is that someone made that call and now refuses to back down because nobody's ever relaxed security like that before
R