May I humbly suggest in my very little knowledge of the machinations of the successive Governments, that 7/7/2005 was the worst terrorist attack in peace time Britain, which happened to be under a Labour Govt., with I assume, 20,000 more policeman? That worked well.
Chill out there fella! You tend to be edging here towards Labour, I could be very wrong of course, but weren't they a Labour Govt. dealing with a Saudi regime? Simple answer really.