I recall right after the attacks in Paris a couple of years ago where over 100 were killed, France the next day went and bombed dozens of ISIS fighters. It was widely reported. They interviewed a man on the street about it and he said something to the effect "12 down, another 100 to go". Basically airing the rage people were feeling and yes, revenge was on the minds of people. A quiet, stoic desire for justice.
I believe an Eye for an Eye if appropriate in these cases. Not only because of justice, but also to send a message, "you attack us, we will attack you. You will not be martyred, you will be eliminated". This is war, there is no other way to define this.
So, if need be England should buy an MOAB or two from America, get the coordinates of where some of these dogs are hiding and let loose, so be it. It's unfortunate that this is how it must be, but the longer these animals are allowed to live and spread their hatred, the more of these cases in which peoples children and slaughtered.
It is thoroughly disgusting and heartbreaking.