In this Channel 4 News exclusive, British and other western jihadi fighters are shown in Syria as never before - fighting and killing, shopping and preparing for a wedding.The exclusive footage focuses on recruits from a hardline Sunni militia of more than 700 foreign fighters in the Katiba al-Muhajireen (the battalion of migrants) and follows Ibrahim al-Mazwagi, the first British fighter to die in Syria. He was killed in February this year, aged just 21.Fighters from the west are flocking to Syria in growing numbers, with estimates that there are now about 80 British recruits in the country among as many as 700 Europeans.In the footage, filmed by an American Muslim convert, Mazwagi can be seen conducting target practice and joining battles on the frontline. He justifies his decision to come to Syria and says: "Well, I've always known about jihad, seen the Mujahadeen on TV and everything."Later in an interview he adds: "Our religion is one of superiority and honour, you know. We can't accept enemies of Allah for our religion - killing us, abusing our religion, belittling it, taking our lands. This is not something we stand for. So the Mujaheddin, those who practise jihad, are those who defend the Muslims."The Katiba al-Muhajireen, now part of a jihadi alliance, is comprised mostly of Chechen and Russian fighters but there are many other recruits from north America, Sweden, Britain and other European countries.Asked when jihad ends for him, al-Mazwagi answers: "When I die." Referring to what might happen to his wife if he dies, he says: "I would rather fight in the path of Allah than be with my wife. I have unlimited time to spend with my wife after I die."