This is a different country tonight. A very different country.
Any political dimension this time (which is contested, but we shall see) will be impossible to portray as foreign.
That is the key difference between this and the IRA, or the INLA, or anything Islamist.
The 7/7 bombers had broad Yorkshire accents, but Anglo-Saxon opinion could still say that, "They're not us, and they wouldn't even want to be us."
It cannot do that this time.
We are in new and uncharted territory here.