Bit of hyperbole there. Since the London Tube bombings 12 years ago, there have been three terrorist attacks in the UK resulting in fatalities - the Lee Rigby killing, the Westminster Bridge attack earlier this year, and this. The Manchester bomb is the first Muslim terrorist killing anywhere outside London. The number of fatalities is significantly less than in the US over the same period.
In the meantime the British police and MI5, currently the object of much derision here on FR, have had multiple successes in preventing attacks - over 90 convictions for planning acts of terrorism in the last three years alone.
Perspective and rationality not wanted here. Our friends and colleagues are consumed by their anti-Brit feeding-frenzy.