Although your solution certainly has it's appeal, I am curious as to the differences in expectation from Britons versus us Yanks. For example, when I go across the pond I can take out traveler's insurance, although I don't recall right off the top of my head whether that would specifically cover terror attacks. I believe that my regular health insurance would cover such an event provided it had international coverage. I wouldn't even think of expecting compensation from the Government, but apparently that's the normal thing in Great Britain, as terror victims who are injured while within the UK are apparently compensated for such things, according to the article.
If nothing else, this sounds like a great opportunity for an insurance company to offer policies to cover such events if it won't be covered by the Government.
Sounds like something right up G. Gordon Liddy's alley. He's already got a mercenary group that will extract you for a sum anywhere in the world if kidnapped. Heard good things about it.