PFR that idea is all very well Providing a period on incarceration and extensive interrogation establishes no vestigial threat exists. In the light of my post about underage WW1 volunteers I cannot accept jihadi brides were young easily bamboozled idiots led astray. I see it more as cool, calculated betrayal of their adopted country, as would many other countries. That should incur penalties. Then we can consider reintegration into society(perhaps!)

This is likely the pattern of modern asymmetric warfare. It is well past the time we had the correct legal framework to deal with it. To use a definition of treason developed 700 years ago makes a mockery of both Parliament and the Judiciary.