The British may be waking up.
They have begun to arm their police.
When the Metropolitan police of Greater London were established, in 1829 by Robert Peel, the English were suspicious of the idea of an armed police force. The fear that such a force could be used to suppress political protest or be used in other mischief was well founded.
It was recognized that for policing to be effective the willing cooperation of the people was a necessity. The use of a minimum of force was part of a larger strategy to gain that cooperation. However when a large group of people arrive, who not only do not consider themselves a part of the community that they live amongst but who view them as enemies, any hope of cooperation or of not needing the ability to do great violence is ludicrous.
The IRA used to call in warnings that a bomb had been placed, because they had some notion that some day the conflict would end. These new Muslim terrorists have a different vision.