I'm certain costs will be covered in any compulsory purchase order.
As an aside, your concerns seem to be the exact definition of a NIMBY. Personally, I prefer progress and would be happy to take a supposed hit for the greater good.
What an odd piece of logic. It's not beyond a terrorist to disable two or more airports if they so choose. In fact they don't actually have to blow them up to disable them, just wait for some slightly cold or slightly hot weather and let nature do their work.
I personally don't think this will happen for another 10-20 years. 1) there is no way Cameron has the bottle to go through with this. 2) big UK infrastructure projects always have 10-20 years of nonsense and only get build when they're finally desperately needed.
Every major report into expansion has concluded Heathrow is the most viable. It's not my view, it's the view of experts. This latest report just cements this opinion.