Handgun ban in the UK apparently didn't stop two terrorists there from getting guns

It took around 20 minutes for police to arrive on the scene after the terrorists attacked the soldier in London.  Apparently the terrorists were able to get guns. Will the British be willing to allow the gun laws that were in place up until 1920?  Of course, Britain's murder rate was much lower back then, but I assume that people will condemn the idea of this "primitive" solution to this threat.  From the UK Telegraph:

In the first terrorist murder on the British mainland since the 7/7 suicide bombings of 2005, the men attempted to behead the soldier, hacking at him like a “piece of meat” in front of dozens of witnesses, before both were shot by police who took around 20 minutes to arrive. . . . 

Speaking with a London accent, holding a knife and a meat cleaver and with his hands dripping with blood, he said:  . . .  

“We must fight them as they fight us. An eye for an eye and a tooth for a tooth. I apologise that women had to witness this today but in our lands our women have to see the same. You people will never be safe. Remove your government, they don’t care about you. Do you think David Cameron is going to get caught in the street when we start busting our guns? Do you think your politicians are going to die?" . . . 

There were also questions over why it took around 20 minutes for armed police to arrive on the scene, during which time the killers calmly walked up and down the road, carrying their bloodied knives and a pistol, while members of the public confronted them.
When police did arrive, both gunmen tried to rush at the police and were shot, reportedly by a female officer. . . .