Re: £57million
Why waste munitions shooting them down? Given the dismal safety record of VTOL aircraft (primarily the Harrier, but including the Yak 38, arguably the V22 and other largely development types) they won't need to shoot them down, merely wait for them to drop out the sky. If the Harrier hadn't been invented in Britain, our papers would have queued up to christen it "the flying coffin" or something similar.
Before anybody reaches for the downvote button, have a look at this link below and question why our idiot government is proposing to buy a kite that combines the most expensive, complex attack aircraft ever developed with VTOL, given the Harrier experience:
http://en.wikipedia.org/wiki/List_of_Harrier_Jump_Jet_family_losses
Now you can downvote me!